What is the use of startsWith method in java

startsWith method:

Note: startsWith() method is used to detect whether the string starts with the specified prefix.

public class StartWith{
    public static void main(String[] args){
        String id[]= {"53011198902280308","52011198711038269","53011197701328291"};
        int number = 0;
        System.out.println("符合条件的字符串有");
        for(int i=0;i<id.length;i++) {
            if(id[i].startsWith("530") == true) {
                number++;
                System.out.println(id[i]);
            }
        }
        System.out.println("前面3个字符为‘530&#39;的身份证有："+number+"个");
    }
}

Running result:

The strings that meet the conditions are
53011198902280308
53011197701328291
The ID cards whose first three characters are '530' are: 2 indivual

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