Java每日一练（5）

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我是靠谱客的博主霸气黑猫，最近开发中收集的这篇文章主要介绍Java每日一练（5），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

1.字符逆序输出

需求说明：将一组乱序的字符进行排序、进行升序、逆序输出

package com.etc.five.day;
import java.util.Arrays;
public class Sort {
public static void main(String[] args) {
String[] Letter={"Q","W","E","R","T","Y","U","I","O","P","A","S","D","F","G","H","J","K","L","Z","X","C","V","B","N","M"};
System.out.println("原字符序列");
for(int i=0;i<Letter.length;i++){
System.out.print(Letter[i]+" ");
}
Arrays.sort(Letter);
System.out.println("n升序排序后：");
for(int i=0;i<Letter.length;i++){
System.out.print(Letter[i]+" ");
}
System.out.println("n降序排序后：");
for(int i=Letter.length-1;i>=0;i--){
System.out.print(Letter[i]+" ");
}
}
}

2.更新会员积分

需求说明：将原有积分进行备份，然后赠送每位会员500积分，编写程序输出积分情况

package com.etc.five.day;
import com.etc.test.util.JudgeNumber;
public class Points {
public static void main(String[] args) {
int[] number = new int[999999];
int[] number2 = new int[999999];
int number3 = 0;
JudgeNumber jn = new JudgeNumber();
System.out.print("请输入会员数目：");
number3 = jn.judge();
for (int i = 1; i <= number3; i++) {
System.out.print("第" + i + "会员积分：");
number[i] = jn.judge();
}
System.out.println("n序列" + "tt" + "历史积分" + "tt" + "新年积分");
for (int i = 1; i <= number3; i++) {
System.out.println(i + "tt" + number[i] + "tt" + (number[i] + 500));
}
}
}

3.打印菱形

练要点：复杂图形分步打印的思想；复杂的二重循环

需求说明：如果用户输入的行数为奇数，则打印出菱形；否则提示用户输入奇数

实现思路： 1、while循环判断是否奇数 2、分步打印

难点指导：打印菱形下半部分

package com.etc.five.day;
import com.etc.test.util.JudgeNumber;
public class Diamond {
public static void main(String[] args) {
int number = 0;
int number2 = 0;
JudgeNumber jn = new JudgeNumber();
System.out.println("请输入菱形行数");
number = jn.odd();
for (int i = 0; i <= number / 2; i++) {
for (int k = number / 2 - 1; k >= i; k--) {
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
for (int i = 0; i <= number / 2; i++) {
for (int j = 0; j <= i; j++) {
System.out.print(" ");
}
for (int k = number/2-2; k >= (i*2-number/2)+2; k--) {
System.out.print("*");
}
System.out.println();
}
}
}

4.实现九九乘法表

package com.etc.five.day;
public class Table {
public static void main(String[] args) {
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(j + "*" + i + "=" + (i * j) + "t");
}
System.out.println();
}
}
}

package com.etc.test.util;
import java.util.Scanner;
public class JudgeNumber {
public int judge() {
int number = 0;
while (true) {
Scanner input = new Scanner(System.in);
if (input.hasNextInt()) {
number = input.nextInt();
break;
} else {
System.out.print("请输入数字：");
}
}
return number;
}
public int odd() {
int number = 0;
while (true) {
Scanner input = new Scanner(System.in);
if (input.hasNextInt()) {
number = input.nextInt();
} else {
System.out.print("请输入数字：");
}
if (number % 2 == 1) {
break;
} else {
System.out.print("请输入奇数：");
}
}
return number;
}
public String name(){
String name="";
while(true){
Scanner input =new Scanner(System.in);
if(input.hasNext()){
name =input.next();
break;
}
}
return name;
}
}