Exceptions

DhirajGadekar · DhirajGadekar · commit 2521325ab5cb · 2023-07-14T22:12:59.000+05:30
diff --git a/Exception-Handling/1_ArithmeticException.java b/Exception-Handling/1_ArithmeticException.java
@@ -0,0 +1,30 @@
+class ArithmeticExceptionClass {
+	
+	void m1() {
+		
+		System.out.println("Start m1");
+		m2();
+		System.out.println("End m1");
+	}
+	void m2() {
+
+		System.out.println(10/0);
+	}
+	public static void main(String[] args) {
+		
+		System.out.println("Start Main");
+		ArithmeticExceptionClass obj = new ArithmeticExceptionClass();
+		obj.m1();
+		System.out.println("End Main");
+	}
+}
+
+/*
+ O/P :
+	Start Main
+	Start m1
+	Exception in thread "main" java.lang.ArithmeticException: / by zero
+		at ArithmeticExceptionClass.m2(1_ArithmeticException.java:11)
+		at ArithmeticExceptionClass.m1(1_ArithmeticException.java:6)
+		at ArithmeticExceptionClass.main(1_ArithmeticException.java:17)
+ */
diff --git a/Exception-Handling/2_NullPointerException.java b/Exception-Handling/2_NullPointerException.java
@@ -0,0 +1,27 @@
+class NullPointerExceptionClass {
+	
+	void m1() {
+		
+		System.out.println("IN m1");
+	}
+	void m2() {
+
+		System.out.println("IN m2");
+	}
+	public static void main(String[] args) {
+		
+		NullPointerExceptionClass obj = new NullPointerExceptionClass();
+		obj.m1();
+
+		obj = null;
+
+		obj.m2();
+	}
+}
+
+/*
+ *O/P : IN m1
+	Exception in thread "main" java.lang.NullPointerException: Cannot invoke "NullPointerExceptionClass.m2()" because "<local1>" is null
+		at NullPointerExceptionClass.main(1_NullPointerException.java:18)
+
+ */
diff --git a/Exception-Handling/3_IOException.java b/Exception-Handling/3_IOException.java
@@ -0,0 +1,18 @@
+import java.io.*;
+
+class IOExceptionClass {
+	
+	public static void main(String[] args) {
+		
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		
+		int data = Integer.parseInt(br.readLine());
+		System.out.println(data);
+	}
+}
+
+/*
+ * O/P : Error: unreported exception IOException; must be caught or declared to be thrown
+		int data = Integer.parseInt(br.readLine());
+		                                       ^	
+ */
diff --git a/Exception-Handling/4_NumberFormatException.java b/Exception-Handling/4_NumberFormatException.java
@@ -0,0 +1,23 @@
+import java.io.*;
+
+class NumberFormatExceptionClass {
+	
+	public static void main(String[] args) throws IOException {
+		
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+		System.out.println("Enter Integer Value : ");
+		int data = Integer.parseInt(br.readLine());
+		System.out.println(data);
+	}
+}
+
+/*
+ * O/P : Enter Integer Value : 
+	 dhiraj
+	 Exception in thread "main" java.lang.NumberFormatException: For input string: "dhiraj"
+		at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
+		at java.base/java.lang.Integer.parseInt(Integer.java:665)
+		at java.base/java.lang.Integer.parseInt(Integer.java:781)
+		at NumberFormatExceptionClass.main(4_NumberFormatException.java:10)
+ */
