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+ //Important the computer class
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+
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+ import com .builder .Computer ;
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+
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+
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+ public class Computer {
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+
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+ //required params.
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+ private String ram ;
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+
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+ private String hdd ;
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+
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+ //optionals params
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+ private boolean isGraphicsCardEnable ;
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+ private boolean isBluetoothEnabled ;
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+
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+ public String getRam (){
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+ return this .ram ;
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+ }
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+
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+ public String getHdd (){
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+ return this .hdd ;
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+ }
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+
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+
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+ public boolean isGraphicsCardEnable (){
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+ return isGraphicsCardEnable ;
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+ }
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+
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+ public boolean isBluetoothEnabled (){
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+ return isBluetoothEnabled ;
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+ }
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+
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+ // Note the private visibility of the constructor, and the builder variable type.
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+
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+ private Computer (ComputerBuilder builder ){
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+
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+ this .ram = com .builder ;
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+ this .hdd = com .builder ;
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+
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+ this .isGraphicsCardEnable = com .isGraphicsCardEnable ;
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+ this .isBluetoothEnabled = com .isBluetoothEnabled ;
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+ }
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+
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+
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+ //the builder inner class
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+
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+ public static class ComputerBuilder {
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+ //required params.
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+ private String ram ;
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+
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+ private String hdd ;
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+
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+ //optionals params
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+ private boolean isGraphicsCardEnable ;
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+ private boolean isBluetoothEnabled ;
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+
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+
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+ public ComputerBuilder (String hdd , String ram ){
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+ this .ram = ram ;
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+ this .hdd = hdd ;
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+ }
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+
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+ public ComputerBuilder setGraphicsCardEnabled (boolean val ){
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+ this .isGraphicsCardEnable = val ;
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+ return this ;
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+ }
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+
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+ public ComputerBuilder setBluetoothEnabled (boolean val ){
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+ this .isBluetoothEnabled = val ;
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+
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+ return this ;
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+ }
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+
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+ // The build function.
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+ public Computer build (){
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+ return new Computer (this );
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+ }
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+ }
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+
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+ }
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