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class unloding by JVM?

 
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what is the meaning?

is it the full program excution is over?


<SECOND DOUBT>
String s=new String();
is a empty object created here with s referring it?
 
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Classes are unloaded at the discretion of the JVM. But they have to at least meet the below restrictions

Instances-If any instance of the class are still in existence then they will not be unloaded.

java.lang.Class-If a class's java.lang.Class object is still being referenced from another object, then it will not be unloaded.

String s=new String(); this code basically creates an object of the type String and assigns it to the s reference variable. And it returns a null when you try to access it.
 
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The string returned by new String() has a value of empty string ("") and not null.
 
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