Java日志第54天 2020.8.30

例5.11 输入三个字符串，要求将字母按由小到大的顺序输出。

import java.util.Scanner;

public class Demo5_11 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String string1, string2, string3;
        String temp;
        System.out.println("Please input three strings:");
        string1 = sc.next();
        string2 = sc.next();
        string3 = sc.next();

        if (string2 .compareTo(string3)>0) {
            temp = string2;
            string2 = string3;
            string3 = temp;
        }
        if (string1.compareTo(string2) <= 0){
            System.out.println(string1+" "+string2+" "+string3);
        } else if (string1.compareTo(string3) <= 0) {
            System.out.println(string2+" "+string1+" "+string3);
        } else {
            System.out.println(string2+" "+string3+" "+string1);
        }
    }
}

 

 

例5.12 一个班有n个学生，需要把每个学生的简单材料（姓名和学号）输入计算机保存。然后可以通过输入某一学生的姓名查找其有关资料。当输入一个姓名后，程序就查找该班中有无此学生，如果有，则输出他的姓名和学号，如果查不到，则输出“本班无此人”。

import java.util.Scanner;

public class Demo5_12 {


    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String find_name;
        String[] name = new String[50];
        String[] num = new String[50];
        int n;
        System.out.print("Please input number of this class:");
        n = sc.nextInt();
        input_data(n,name,num);
//        for (int i = 0; i < n; i++) {
//            System.out.println(name[i]+num[i]);
//        }
        System.out.print("Please input name you want find:");
        find_name = sc.next();
        search(find_name,n,name,num);
    }
    private static void input_data(int n,String name[], String num[]) {
        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < n; i++) {
            System.out.print("Input name and NO. of student"+(i+1)+":");
            name[i] = sc.next();
            num[i] = sc.next();
        }
    }

    private static void  search(String find_name, int n, String name[],String num[]) {
        boolean flag = false;
        for (int i = 0; i < n; i++) {
            if (name[i].equals(find_name)) {
                System.out.println(name[i] + " has been found, his number is " + num[i]);
                flag = true;
                break;
            }
        }
        if (flag == false)
            System.out.println("Can't find this name");
    }

}