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Example to show cast exception in java
Posted on: October 23, 2008 at 12:00 AM

Here we are describing the use of using exception class in java .Exceptions are the way in Java to indicate to a calling method that an abnormal condition has occurred.

Example to show cast exception in java

In this Tutorial we want to describe you a program that makes understand cast exception in java. The casting mean converting one data type into another data type. The tutorial illustrates to handle cast exception in your programs.

The example will show you to convert one data type into another data type by using type casting. The step involved in the program are given below-

Vector v = new Vector():-Creates a new vector.

Object obj = v.add( i ):-Adds an integer type to the vector and stores in an object

To avoid this exception we have to add Integer y = new Integer((String)obj) instead of String y = (String)obj.

CastException.java

import java.util.Vector;

public class CastException {

  public static void main(String[] args) {
  Vector v = new Vector();
  int i = 10;
  Object obj = v.add(i);
  try {
  String y = (String)obj;
  v.add(y);
} catch (ClassCastException e) {
  System.out.println("Class is really: " + obj.getClass().getName());
  e.printStackTrace();
  }
  }
}

Output of the program

java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
at CastException.main(CastException.java:11)

To avoid this exception we have to add Integer y = new Integer((String)obj) instead of String y = (String)obj.

Download SourceCode

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