Why string class is immutable in java

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Your Answer

When we create a string in java like String s1="hello"; then an object will be created in string pool(hello) and s1 will be pointing to hello.Now if again we do String s2="hello"; then another object will not be created but s2 will point to hello because JVM will first check if the same object is present in string pool or not.If not present then only a new one is created else not. Now if suppose java allows string mutable then if we change s1 to hello world then s2 value will also be hello world so java String is immutable.

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