How to get hash code from a java object ???

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COMPLETE SOURCE CODE FOR : GetObjectHashCode.java
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public class GetObjectHashCode
{
public static void main(String[]args)
{
 //Create a String object with value Hello
 String stringObject=new String("Hello");

 //Print hash code for the object
 System.out.println("HASH CODE VALUE : "+stringObject.hashCode());
}
}

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How to clone a java object ???

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COMPLETE SOURCE CODE FOR : CloneObjectInJava.java
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//Class for object that you want to clone must overwrite method clone() first

public class CloneObjectInJava implements Cloneable
{
public void printAText()
{
 System.out.println("HI");
}

//OVERWRITE METHOD CLONE
public Object clone()
{
 Cloneable makeClone=new CloneObjectInJava();
 return makeClone;
}

public static void main(String[]args)
{
 //Create a CloneObjectInJava object name "coij"
 CloneObjectInJava coij=new CloneObjectInJava();

 try
 {
  //Create clone for "coij"
  CloneObjectInJava coijClone=(CloneObjectInJava)coij.clone();
  //Call method printAText using clone
  coijClone.printAText();
 }
 catch(Exception exception)
 {
  exception.printStackTrace();
 }
}
}

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How to get amount of free memory in jvm ???

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COMPLETE SOURCE CODE FOR : FreeMemoryInJvm.java
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public class FreeMemoryInJvm
{
public static void main(String[]args)
{
 System.out.println("Free Memory In Jvm is : "+Runtime.getRuntime().freeMemory()+" bytes");
}
}

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How to know maximum amount of memory that will be use by jvm ???

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COMPLETE SOURCE CODE FOR : MaxMemoryThatJvmWillUse.java
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public class MaxMemoryThatJvmWillUse
{
public static void main(String[]args)
{
 System.out.println("Max Amount Of Memory That Will Be Use By Jvm is : "+Runtime.getRuntime().maxMemory()+ " bytes");
}
}

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How to get total memory in jvm ???

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COMPLETE SOURCE CODE FOR : GetTotalMemoryInJvm.java
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public class GetTotalMemoryInJvm
{
public static void main(String[]args)
{
 //Print total memory in java virtual machine in bytes
 System.out.println("TOTAL MEMORY IN JVM : "+Runtime.getRuntime().totalMemory());
}
}

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What is java memory heap ???

What is java memory heap ???
It is an area in memory where an object are created

How to make java program output to a file instead of command prompt like usual ???

This source code will show you how to make java output that print in command prompt will be print in a file instead of command prompt.

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COMPLETE SOURCE CODE FOR : PutCommandPromptOutputToFile.java
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import java.io.PrintStream;

public class PutCommandPromptOutputToFile
{
public static void main(String[]args)
{
 try
 {
  PrintStream newOuputChannel=new PrintStream("output.txt");
  System.setOut(newOuputChannel);

  System.out.println("HI");
 }
 catch(Exception exception)
 {
  exception.printStackTrace();
 }
}
}

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Source code to know how long a java application is running

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COMPLETE SOURCE CODE FOR : HowLongApplicationRunning.java
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public class HowLongApplicationRunning
{
public static void main(String[]args)
{
 long startTime=System.currentTimeMillis();

 try
 {
  //MAKE YOUR APPLICATION SLEEP IN 10 SECONDS
  Thread.sleep(10000);
 }
 catch(Exception exception)
 {
  exception.printStackTrace();
 }

 long endTime=System.currentTimeMillis();

 //GET DURATION IN SECOND
 long timeInSecond=(endTime-startTime)/1000;

 System.out.println("Duration For Your Application Running Is : "+timeInSecond+" seconds");
}
}

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Java source code to determine when application exit by print a line of text on command prompt

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COMPLETE SOURCE CODE FOR : DetermineWhenApplicationExit.java
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public class DetermineWhenApplicationExit
{
public static void main(String[]args)
{
 Runtime.getRuntime().addShutdownHook(new Thread()
 {
  public void run()
  {
   //Application will print "BYE" when it close
   System.out.println("BYE");
  }
 });

 //Make this application terminate
 System.exit(0);
}
}

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Java source code for application terminate (Exit application)

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COMPLETE SOURCE CODE FOR : ExitApplication.java
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public class ExitApplication
{
public static void main(String[]args)
{
 //System.exit(0) will make your application exit
 System.exit(0);
}
}

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