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update basics (examplehub#196)
* ValidSudoku * valid sudoku * update autoboxing * update basics
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9 files changed

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9 files changed

+286
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‎src/main/java/com/examplehub/basics/number/DoubleExample.java

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package com.examplehub.basics.number;
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public class DoubleExample {
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}

‎src/main/java/com/examplehub/basics/oop/ObjectExample.java

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package com.examplehub.basics.oop;
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public class ObjectExample {
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}

‎src/main/java/com/examplehub/leetcode/middle/ValidSudoku.java

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@@ -29,7 +29,6 @@ public static boolean solution1(char[][] board) {
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return false;
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}
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}
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// travel all sub-box
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// TODO
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return true;

‎src/test/java/com/examplehub/basics/bool/BooleanExampleTest.java

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@@ -48,4 +48,24 @@ void testTernaryOperator() {
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int abs = num < 0 ? -num : num;
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assertEquals(3, abs);
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}
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@Test
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void testValueOf() {
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Boolean b = Boolean.valueOf(true);
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assertTrue(b.booleanValue());
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b = Boolean.valueOf("false");
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assertFalse(b.booleanValue());
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}
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@Test
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void testAutoBoxing() {
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Boolean b = false;
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System.out.println(b);
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assertFalse(b);
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boolean bValue = b;
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System.out.println(bValue);
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assertFalse(bValue);
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}
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}

‎src/test/java/com/examplehub/basics/chars/CharExampleTest.java

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@@ -32,4 +32,63 @@ void testAddAndSub() {
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assertEquals(9, '9' - '0');
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assertEquals(0, 'a' - 97);
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}
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@Test
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void testValueOf() {
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Character c = Character.valueOf('A');
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assertEquals('A', c.charValue());
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}
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@Test
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void testAutoboxing() {
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Character c = 'A';
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System.out.println(c);
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assertEquals('A', c);
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}
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@Test
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void testIsLower() {
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assertFalse(Character.isLowerCase('A'));
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assertTrue(Character.isLowerCase('a'));
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assertFalse(Character.isLowerCase('1'));
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}
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@Test
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void testIsUpper() {
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assertTrue(Character.isUpperCase('A'));
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assertFalse(Character.isUpperCase('a'));
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assertFalse(Character.isUpperCase('1'));
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}
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@Test
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void testIsDigit() {
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System.out.println(Character.isDigit('A'));
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System.out.println(Character.isDigit('a'));
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System.out.println(Character.isDigit('1'));
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assertFalse(Character.isDigit('A'));
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assertFalse(Character.isDigit('a'));
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assertTrue(Character.isDigit('1'));
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}
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@Test
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void testToLower() {
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assertEquals('a', Character.toLowerCase('A'));
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}
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@Test
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void testToUpper() {
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assertEquals('A', Character.toUpperCase('a'));
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}
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@Test
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void testGetNumericValue() {
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System.out.println(Character.getNumericValue('8'));
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assertEquals(8, Character.getNumericValue('8'));
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System.out.println(Character.getNumericValue('A'));
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System.out.println(Character.getNumericValue('a'));
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assertEquals(10, Character.getNumericValue('A'));
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assertEquals(10, Character.getNumericValue('a'));
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}
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}

‎src/test/java/com/examplehub/basics/number/DoubleExampleTest.java

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package com.examplehub.basics.number;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.*;
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class DoubleExampleTest {
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@Test
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void testValueOf() {
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Double d = Double.valueOf(3.14);
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System.out.println(d.doubleValue());
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assertEquals(3.14, d.doubleValue());
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d = Double.valueOf("3.14159");
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System.out.println(d.doubleValue());
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assertEquals(3.14159, d.doubleValue());
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}
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@Test
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void testIsNaN() {
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Double d = 0.0 / 0;
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assertEquals(d, Double.NaN);
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}
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@Test
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void testAutoboxing() {
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Double d = 3.14;
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assertEquals(3.14, d.doubleValue());
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double pi = d;
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assertEquals(3.14, pi);
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}
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}

‎src/test/java/com/examplehub/basics/number/IntegerExampleTest.java

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import static org.junit.jupiter.api.Assertions.*;
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import jdk.jfr.StackTrace;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.function.Executable;
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class IntegerExampleTest {
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@Test
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void testValueOf() {
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Integer integer = Integer.valueOf(100);
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System.out.println(integer);
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assertEquals(100, integer.intValue());
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integer = Integer.valueOf("123");
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System.out.println(integer);
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assertEquals(123, integer.intValue());
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integer = Integer.valueOf("a", 16);
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System.out.println(integer);
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assertEquals(10, integer.intValue());
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}
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@Test
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void testParseInt() {
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int number = Integer.parseInt("123");
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System.out.println(number);
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assertEquals(123, number);
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assertThrows(NumberFormatException.class, () -> {
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int num = Integer.parseInt("123a");
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fail();
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});
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}
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@Test
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void testAutoBoxing() {
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Integer integer = 10;
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assertEquals(10, integer.intValue());
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Integer integer1 = 10;
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assertTrue(integer == integer1);
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assertTrue(integer.equals(integer1));
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Integer first = 128;
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Integer second = 128;
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System.out.println(first == second);
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assertNotSame(first, second);
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}
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@Test
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assertTrue(true);
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}
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}
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@Test
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void testToBinaryString() {
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assertEquals("1010", Integer.toBinaryString(10));
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}
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@Test
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void testToOctalString() {
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assertEquals("12", Integer.toOctalString(10));
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}
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@Test
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void test(){
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assertEquals("a", Integer.toHexString(10));
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}
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}

‎src/test/java/com/examplehub/basics/oop/ObjectExampleTest.java

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package com.examplehub.basics.oop;
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import org.junit.jupiter.api.Test;
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import java.util.Objects;
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import static org.junit.jupiter.api.Assertions.*;
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class ObjectExampleTest {
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@Test
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void testObject() {
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Object o = new Object();
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System.out.println(o);
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}
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@Test
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void testEquals() {
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class Student {
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private int id;
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private String name;
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public Student(int id, String name) {
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this.id = id;
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this.name = name;
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}
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}
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class People {
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private final String name;
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private final int age;
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public People(String name, int age) {
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this.name = name;
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this.age = age;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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People people = (People) o;
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return age == people.age && Objects.equals(name, people.name);
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}
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@Override
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public int hashCode() {
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return 0;
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}
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}
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Student stu1 = new Student(10001, "duyuanchao");
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Student stu2 = new Student(10001, "duyuanchao");
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assertNotSame(stu1, stu2);
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assertNotEquals(stu1, stu2);
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People p1 = new People("duyuanchao", 25);
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People p2 = new People("duyuanchao", 25);
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People p3 = new People("jack", 25);
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assertNotSame(p1, p2);
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assertEquals(p1, p2);
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assertNotEquals(p1, p3);
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}
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@Test
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void testHashCode() {
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class People {
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private final String name;
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private final int age;
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public People(String name, int age) {
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this.name = name;
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this.age = age;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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People people = (People) o;
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return age == people.age && Objects.equals(name, people.name);
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}
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@Override
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public int hashCode() {
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return this.age % 13;
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}
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}
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People p1 = new People("duyuanchao", 25);
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People p2 = new People("duyuanchao", 25);
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assertEquals(p1.hashCode(), p2.hashCode());
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}
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@Test
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void testToString() {
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class People {
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private final String name;
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private final int age;
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public People(String name, int age) {
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this.name = name;
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this.age = age;
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}
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@Override
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public String toString() {
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return "name = " + name + ", age = " + age;
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}
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}
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People people = new People("duyuanchao", 25);
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assertEquals("name = duyuanchao, age = 25", people.toString());
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}
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}

‎src/test/java/com/examplehub/basics/utils/MathUtilsExampleTest.java

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@@ -51,4 +51,11 @@ void testRandom() {
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double randomNumber = Math.random();
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assertTrue(randomNumber >= 0 && randomNumber < 1);
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}
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@Test
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void testRound() {
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assertEquals(3, Math.round(3.14));
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assertEquals(4, Math.round(3.78));
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assertEquals(-3, Math.round(-3.14));
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}
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}

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