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Custom Exception example for BankAccount

class BankAccount {      int accountNumber;     double accountBalance;     public BankAccount(int accountNumber, double accountBalance) {         this.accountNumber = accountNumber;         this.accountBalance = accountBalance;     }     public int getAccountNumber() {         return accountNumber;     }     public double getAccountBalance() {         return accountBalance;     }           public boolean withdraw (double amount) throws WithdrawLimitException     {         if( amount > accountBalance) {                      throw new WithdrawLimitException("Withdrawing Amount is more than Balance amount.. ");                       ...
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HashMap HashSet example

package utilpackageapplication; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; class Student {   int sid;     String sname;     public Student(int sid, String sname) {         this.sid = sid;         this.sname = sname;     }     public int getSid() {         return sid;     }     public void setSid(int sid) {         this.sid = sid;     }     public String getSname() {         return sname;     }     public void setSname(String sname) {         this.sname = sname;     }     } public class HashMap {     public static void main(String[] args) {             Student sd1 = new Student(1,"Udit");             Stu...
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Annotation

import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import java.util.Date; /**  *  * @author bhavesh  */ @Retention(RetentionPolicy.CLASS) @Target(ElementType.TYPE) public @interface NewAnnotation {         public String name();     public int myno() default 10;     //public Date mydate =new Date();                 } /**  *  * @author bhavesh  */ class A {     public void test()     {             } } class B extends A {     @Override     public void test()     {             } } // Use of annotation called NewAnnotation .... @NewAnnotation(name="ISTAR")       public class ClassAnnotationTest { ...
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