JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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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

Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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I don’t know the key to success, but the key to failure is trying to please everybody.
-- Bill Cosby

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].

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