Issues to be aware of when using string

When using string, we should pay attention to the problem: Try not to do string concatenation operations frequently. Because once the string is created immutable, as long as it is frequently spliced, a large number of string objects are created in the string constant pool, causing problems with garbage collection.

Public  class stringtest04{    public static void main ( String[] args) {        string[] ins={"Sport", "music", "food" , "Sleep"};        //asked to stitch the above interest into a string "Sport,music,food,sleep"          string temp= "";         for (int i=0;i<ins.length;i++) {             if (i==i.length-1) {                 temp += ins[i];            }else{                 temp +=  ins[i]+ ",";            }        &nBSP;} &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN (TMP);     }}

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Issues to be aware of when using string