How to use try and catch keywords?

Enclose the code that you want to monitor inside a try block and catch clause.

 

The following program includes a try block and a catch clause that processes the ArithmeticException generated by the division-by-zero error:

public class Main {

  public static void main(String args[]) {

    int d, a;

    try { // monitor a block of code.

      d = 0;

      a = 42 / d;

      System.out.println("This will not be printed.");

    } catch (ArithmeticException e) { // catch divide-by-zero error

      System.out.println("Division by zero.");

    }

    System.out.println("After catch statement.");

  }

}

Once an exception is thrown, program control transfers out of the try block into the catch block. Execution never returns to the try block from a catch.

The following code handles an exception and move on.

 

 

import java.util.Random;

 

public class Main {

  public static void main(String args[]) {

    int a = 0, b = 0, c = 0;

    Random r = new Random();

    for (int i = 0; i < 32000; i++) {

      try {

        b = r.nextInt();

        c = r.nextInt();

        a = 12345 / (b / c);

      } catch (ArithmeticException e) {

        System.out.println("Division by zero.");

        a = 0; // set a to zero and continue

      }

      System.out.println("a: " + a);

    }

  }

}