String类初识

package lei;
public class TestString {
    public static void main(String[] args) {
        String s="郭明明成精说过";
String s1="中国人ok";
System.out.println(s.length());
System.out.println(s1.getBytes().length);
System.out.println(s1.charAt(1));   
System.out.println(s.contains("明而"));
System.out.println(s.endsWith("过"));
System.out.println(s.startsWith("郭"));
System.out.println(s.indexOf("明"));
System.out.println(s.substring(3, 5));
//s.replaceAll("", "");
//System.out.println(s);
//这个运行不了，因为s不能修改
String s11=s.replaceAll("成精","曾经");
System.out.println(s11);
    
    }

}