package charpter2; import java.util.Scanner; public class Test { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入您想输入的内容:"); /*int num = sc.nextInt(); System.out.println(num); String name = sc…
String的用法很活跃,也用到的很多.可以根据自己的需要查询API.这里只有concat和substring,indexof的用法 class TestString { public static void main(String[] args) { String s = new String("12cx;x"); String a = "cxx"; System.out.println(s); System.out.println(a); System.out.…