package com.tets;
public class Demo2 {
public static void main(String[] args){
String str="Hello world";
String str2="hello world";
int len=str.length();
boolean b=str.startsWith("H");
boolean c=str2.contains("Hello");
boolean d=str2.endsWith("d");
System.out.println("字符串的长度是"+len);
System.out.println(b+c+d);
}
}