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'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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