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String methods

 
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String s17="AMIT";
String s18="amit";
String s19=" amit ";
System.out.println(s19.trim()==s18);-false
System.out.println(s19.trim().equals(s18));-true
System.out.println(s18.toUpperCase()==s17);-false
System.out.println(s18.toUpperCase().equals(s17));-true

I just want to clear my doubt. Do substring, replace, trim & to UpperCase all String methods returns new instance? I just conclude from above output.

Correct me if I am wrong.
 
Java Cowboy
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If you really want to know, you can have a look at the source code for class String. You can find it in the file src.zip which is in your JDK installation directory.
 
dolly shah
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Should I except this kind of questions on the real exam?
 
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Generally, String methods return a new String literal.

StringBuilder methods modify the source String.
 
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Strings are im.mutable objects
 
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