JAVA EXAMPLE PROGRAMS

Throw Clause Examples

Use 'throw' statement to throw an exception or simply use the throw clause with an object reference to throw an exception.
The syntax is 'throw new Exception();'. Even you can pass the error message to the Exception constructor.

Below example shows how to throw an exception.

Throw Clause Sample Code

Code:

package com.myjava.exceptions;

public class MyExplicitThrow {
    public static void main(String a[]){
        try{
            MyExplicitThrow met = new MyExplicitThrow();
            System.out.println("length of JUNK is "+met.getStringSize("JUNK"));
            System.out.println("length of WRONG is "+met.getStringSize("WRONG"));
            System.out.println("length of null string is "+met.getStringSize(null));
        } catch (Exception ex){
            System.out.println("Exception message: "+ex.getMessage());
        }
    }
    
    public int getStringSize(String str) throws Exception{
        if(str == null){
            throw new Exception("String input is null");
        }
        return str.length();
    }
}

Example Output

length of JUNK is 4
length of WRONG is 5
Exception message: String input is null

Other Exception Handling Examples

Java2Novice - YouTube Channel

Java2Novice

Knowledge Centre

Where can we use serialization?

Whenever an object has to sent over the network, those objects should be serialized. Also if the state of an object is to be saved, objects need to be serilazed.

Famous Quotations

There is a great difference between worry and concern. A worried person sees a problem, and a concerned person solves a problem.

-- Harold Stephens

Few Random Java Examples

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

Most Visited Pages

Other Interesting Sites

Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.