String s = new String(“xyz”). How many objects has been made after this line of code execute?

前端 未结 20 3055
再見小時候
再見小時候 2020-11-27 02:45

The commonly agreed answer to this interview question is that two objects are created by the code. But I don\'t think so; I wrote some code to confirm.

publi         


        
20条回答
  •  生来不讨喜
    2020-11-27 03:09

    public String(String original) {
        int size = original.count;
        char[] originalValue = original.value;
        char[] v;
        if (originalValue.length > size) {
            // The array representing the String is bigger than the new
            // String itself.  Perhaps this constructor is being called
            // in order to trim the baggage, so make a copy of the array.
            int off = original.offset;
            v = Arrays.copyOfRange(originalValue, off, off+size);
        } else {
            // The array representing the String is the same
            // size as the String, so no point in making a copy.
            v = originalValue;
        }
        this.offset = 0;
        this.count = size;
        this.value = v;
    }
    

    If we see the code , we can see it will just create a char[] and it will get copied every time with same content get instantiated and yes it will store data in String Constant Pool . 1)Will take from SCP String s1 = "a" String s2 = "a"; 2)Creates a new object String s3 = new String("a"); Curiosity , New Object String s2=new String("a"); In all above code same char[] will get copied.i:e char[] value You can check here

提交回复
热议问题