JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Finally Block Examples

  • The finally block always executes immediately after try-catch block exits.
  • The finally block is executed incase even if an unexpected exception occurs.
  • The main usage of finally block is to do clean up job. Keeping cleanup code in a finally block is always a good practice, even when no exceptions are occured.
  • The runtime system always executes the code within the finally block regardless of what happens in the try block. So it is the ideal place to keep cleanup code.

Finally Block Sample Code

Code:
package com.myjava.exceptions;

public class MyFinallyBlock {
    public static void main(String[] a){
        /**
         * Exception will occur here, after catch block
         * the contol will goto finally block. 
         */
        try{
            int i = 10/0;
        } catch(Exception ex){
            System.out.println("Inside 1st catch Block");
        } finally {
            System.out.println("Inside 1st finally block");
        }
        /**
         * In this case exception won't, after executing try block
         * the contol will goto finally block. 
         */
        try{
            int i = 10/10;
        } catch(Exception ex){
            System.out.println("Inside 2nd catch Block");
        } finally {
            System.out.println("Inside 2nd finally block");
        }
    }
}

Example Output

Inside 1st catch Block
Inside 1st finally block
Inside 2nd finally block

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Other Exception Handling Examples

Knowledge Centre
wait Vs sleep methods
sleep(): It is a static method on Thread class. It makes the current thread into the "Not Runnable" state for specified amount of time. During this time, the thread keeps the lock (monitors) it has acquired.

wait(): It is a method on Object class. It makes the current thread into the "Not Runnable" state. Wait is called on a object, not a thread. Before calling wait() method, the object should be synchronized, means the object should be inside synchronized block. The call to wait() releases the acquired lock.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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