写出String类的经常使用方法以及做用

1.用字符数组value建立一个String对象 实例:java char[] value ={"a","b","c","d"}; String str = new String(value); //至关于String str = newString("abcd") 2.用字符数组以x开始的n个字符建立一个String对象 实例:web char[] value ={"a","b","c","d"

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