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Thursday 9 January 2014

Is it possible to overload main() method of java. If yes, explain with example.

Ans:
Yes, it is possible to overload main() method in java. You can have more than one main method but with different argument list.
A simple example of overloading main method:

//Test.java
class Test
{
public static void main(String abc[])
{
System.out.println("In Main method");
main(10);
}
static void main(int num)
{
System.out.println("Overloaded main method : prints number :" + num);
}
}

Wednesday 8 January 2014

Create multiple threads in java and assign different sleep() time to each Thread.

//Test.java

class simpleThread extends Thread
{
public simpleThread(String str)
{
super(str);
}
public void run()
{
for(int i=0;i<5;i++)
{
try{
String threadName=getName();
if(threadName.equals("A")){
System.out.println(i +": Thread Name: " + getName());
sleep(1000);
}
else if(threadName.equals("B")){
System.out.println("                    "+i +": Thread Name: " + getName());
sleep(3000);
}
else
{
System.out.println("                                        "+i +": Thread Name: "+ getName());
sleep(5000);
}
}
catch(Exception e){System.out.println(e);}
}
}
}

class Test
{
public static void main(String abc[])
{
System.out.println("-----------------------------------------------------------");
new simpleThread("A").start();
new simpleThread("B").start();
new simpleThread("C").start();
}
}

Simple example of Multi Threading in java. Create multiple threads in java.

//Test.java

class simpleThread extends Thread
{
public simpleThread(String str)
{
super(str);
}
public void run()
{
for(int i=0;i<5;i++)
System.out.println(i +": Thread Name: " + getName());
{
try{
sleep(1000);
}
catch(Exception e){System.out.println(e);}
}
}
}

class Test
{
public static void main(String abc[])
{
System.out.println("-----------------------------------------------------------");
new simpleThread("A").start();
new simpleThread("B").start();
}
}