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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JUST COMPILE AND EXECUTE IT
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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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JUST COMPILE AND EXECUTE IT
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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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JUST COMPILE AND EXECUTE IT
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