How to create characters in java

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(1) if a string is created by direct assignment (String s = "xxx"), if there is no related string in the string constant pool, the string will be created in the string constant pool first, and then the reference address will be returned to the variable.

(2) if the new keyword is used to create an object, it will first determine whether the string exists in the string constant pool. If so, only create a string object on the heap and point to the string in the string constant pool. If the string is not changed in the string constant pool, two objects will be created. Create the string in the constant pool first, and then return the reference to the object on the heap.

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