JAVA程序代码(20)

1百分制分数到等级分数

package pm;

public class SwitchTest {

//编写程序，实现从百分制分数到等级分数的转换

//

//>=90 A

// 80~89 B

// 70~79 C

// 60~69 D

// <60 E

public static void main(String[] args) {

int s=871;

switch(s/10){

case 10 :System.out.println("A");break;

case 9 :System.out.println("A");break;

case 8 :System.out.println("B");break;

case 7 :System.out.println("c");break;

case 6 :System.out.println("D");break;

default :System.out.println("E");break;

}

}

}

2成法口诀阵形

package pm;

public class SwitchTest{

public static void main(String[] args){

for(int i=1;i<=19;i++){

for(int j=1;j<=i;j++){

System.out.print(j+"*"+i+"="+(i*j)+"\t");

}

System.out.println();

}

}

}

3华氏和摄氏的转换法

package pm;

import java.util.Scanner;

public class SwitchTest {

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

while (true) {

System.out.println("请输入要转换的温度类型：C 或F");

String s = sc.next().trim();

if ("c".equalsIgnoreCase(s)) {

//做摄氏向华摄的转换

System.out.println("请输入要转换摄氏的温度:..");

double db = sc.nextDouble();

double db2 = (db * 9 / 5) + 32;

System.out.println("对应的华氏温度：" + db2 + "F");

} else if ("f".equalsIgnoreCase(s)) {

//做华摄向摄氏的转换

System.out.println("请输入要转换华氏的温度:..");

double db = sc.nextDouble();

double db2 = (db - 132) * 5 / 9;

System.out.println("对应的摄氏温度：" + Math.round(db2) + "C");

}else if("exit".equalsIgnoreCase(s)){

break;

}

}

}

}

package pm;

import java.util.Scanner;

public class SwitchTest{

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

boolean flag=true;

while (flag) {

System.out.println("请输入要转换的温度,如：50c或100f");

String str = sc.nextLine().trim();

if (str.endsWith("c") || str.endsWith("C")) {

//做摄氏向华摄的转换30c

String st = str.substring(0, str.length() - 1);

double db = Double.parseDouble(st);//[0,2)

//2 double db=Double.valueOf(st).doubleV alue();

double db2 = (db * 9 / 5) + 32;

System.out.println("对应的华氏温度：" + db2 + "F");

} else if (str.endsWith("f") || str.endsWith("F")) {

//做华摄向摄氏的转换

String st = str.substring(0, str.length() - 1);

double db = Double.parseDouble(st);//[0,2)

//2 double db=Double.valueOf(st).doubleV alue();

double db2 = (db - 132) * 5 / 9;

System.out.println("对应的摄氏温度：" + Math.round(db2) + "C");

}else if("exit".equalsIgnoreCase(str)){

flag=false;

}

}

}

}

4三个数的最大数

package pm;

public class SwitchTest {

public static void main(String[] args) {

int a=1,b=2,c=3,d=0;

d=a>b?a:b;

d=a>b?(a>=c?a:c):(b=>c?b:c);

System.out.println("最多数为："+d);

}

}

5简单计算器的小程序

package one;

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Jsq implements ActionListener { private JFrame frame;

private JButton[] bus;

private JTextField jtx;

private JButton bu;

private char[] strs;

private String d_one = "";

private String operator;

public static void main(String[] args) {

new Jsq();

}

/* 利用构造进行实例化*/

public Jsq() {

frame = new JFrame("计算器");

jtx = new JTextField(14);

bus = new JButton[16];

strs = "789/456*123-0.+=".toCharArray();

for (int i = 0; i < 16; i++) {

bus[i] = new JButton(strs[i] + "");

bus[i].addActionListener(this);

}

bu = new JButton("C");

bu.addActionListener(this);

init();

}

/* GUI 初始化*/

public void init() {

JPanel jp1 = new JPanel();

jp1.add(jtx);

jp1.add(bu);

frame.add(jp1, BorderLayout.NORTH);

JPanel jp2 = new JPanel();

jp2.setLayout(new GridLayout(4, 4));

for (int i = 0; i < 16; i++) {

jp2.add(bus[i]);

}

frame.add(jp2, BorderLayout.CENTER);

frame.pack();

frame.setLocation(300, 400);

frame.setV isible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }

/* 事件的处理*/

public void actionPerformed(ActionEvent arg0) {

/*获取输入字符*/

String conn = arg0.getActionCommand();

/*清除计算器内容*/

if ("C".equals(conn)) {

d_one = "";

operator = "";

jtx.setText("");

return;

}

/*暂未实现该功能*/

if(".".equals(conn)){

return;

}

/*记录运算符，保存运算数字*/

if (("+-*/".indexOf(conn)) != -1) {

if("".equals(d_one) && "".equals(jtx.getText())) return;

d_one = jtx.getText();

operator = conn;

jtx.setText("");

return;

}

/*计算结果*/

if ("=".equals(conn)) {

if("".equals(d_one) && "".equals(jtx.getText())) return;

double db = 0;

if ("+".equals(operator)) {

db = Double.parseDouble(d_one)

+ Double.parseDouble(jtx.getText());

jtx.setText(db + "");

}

if ("-".equals(operator)) {

db = Double.parseDouble(d_one)

- Double.parseDouble(jtx.getText());

jtx.setText(db + "");

}

if ("*".equals(operator)) {

db = Double.parseDouble(d_one)

* Double.parseDouble(jtx.getText());

jtx.setText(db + "");

}

if ("/".equals(operator)) {

db = Double.parseDouble(d_one)

/ Double.parseDouble(jtx.getText());

jtx.setText(db + "");

}

d_one = db + "";

return;

}

//界面显示

jtx.setText(jtx.getText() + conn);

}

}

6三角形图案

package pm;

public class SwitchTest{

public static void main(String[] args){

int n=5;

for(int i=0;i<=n;i++){

for(int j=0;j

System.out.print(" ");

}

for(int k=0;k<2*i-1;k++){

System.out.print("*");

}

System.out.println();

}

}

}

7输出输入的姓名

package pm;

import java.util.Scanner;

public class SwitchTest{

public static void main(String[] args){

String name=null;

Scanner sca=new Scanner (System.in);

char firstChar;

do{

System.out.println("please input your name");

name=sca.nextLine();

firstChar=name.charAt(0);

}while(!(firstChar>='a' && firstChar<='z' ||

firstChar>='A' && firstChar<='Z'));

System.out.println("OK! your name is:"+name);

}

}

8一小时倒计时小程序

package pm;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class SwitchTest {

private JFrame frame;

private JLabel jl1;

private JLabel jl2;

private JLabel jl3;

/*主方法*/

public static void main(String[] args) {

new SwitchTest().getTime();

}

/*倒计时的主要代码块*/

private void getTime(){

long time=1*3600;

long hour =0 ;

long minute =0 ;

long seconds=0;

while(time>=0){

hour=time/3600;

minute=(time-hour*3600)/60;

seconds=time-hour*3600-minute*60;

jl1.setText(hour+"时");

jl2.setText(minute+"分");

jl3.setText(seconds+"秒");

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

time--;

}

}

/*构造实现界面的开发GUI */

public SwitchTest(){

frame = new JFrame("倒计时");

jl1 = new JLabel();

jl2 = new JLabel();

jl3 = new JLabel();

init();

}

/*组件的装配*/

private void init(){

JPanel jp=new JPanel();

jp.add(jl1);

jp.add(jl2);

jp.add(jl3);

frame.add(jp);

frame.setV isible(true);

frame.setLocation(300,400);

frame.setSize(300, 200);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

9棋盘图案

public class Sjx{

public static void main(String[] args){

int SIZE=19;

for(int i=0;i

if(i<10){

System.out.print(" "+i);//两个空格

}else{

System.out.print(" "+(char)(i+'a'-10));//两个空格

}

}

System.out.println();

// System.out.print(i<10?(char)(i+'0'):(char)(i+'a'-10));

for(int i=0;i

if(i<10){

System.out.print(i+" ");//一个空格

}else{

System.out.print((char)(i+'a'-10)+" ");//一个空格

}

for(int j=0;j

System.out.print("*"+" ");//两个空格

}

System.out.println();

}

}

}

10数组输出唐诗

package day04;

public class ArrayTest {

public static void main(String[] args){

char[][] arr=new char[4][7];

String s="朝辞白帝彩云间千里江陵一日还两岸猿声啼不住轻舟已过万重山";

for(int i=0;i

for(int j=0;j

arr[i][j]=s.charAt(i*7+j);

}

}

for(int i=0;i

for(int j=0;j

System.out.print(arr[arr.length-j-1][i]+" ");

}

System.out.println();

}

}

}

11找出满足条件的最小数

package day02;

public class Fangk{

public static void main(String[] args){

// for(int i=1000;i<=9999;i++){

// int q=i/1000;

// int b=i/100%10;

// int s=i/10%10;

// int g=i%10;

// if(q>b && s>g && q+g==b+s && b%2!=0){

// System.out.println("The Min Number is:"+i);

// break;

// }

// }

loop1: for(int q=1;q<=9;q++){

loop2: for(int b=0;b<=9;b++){

if(b%2==0){

continue loop2;

}

for(int s=0;s<=9;s++){

for(int g=0;g<=9;g++){

if(q>b && s>g && q+g==b+s){

System.out.println("The Min Number is:"+(q*1000+b*100+s*10+g));

break loop1;

}

}

}

}

}

}

}

12判断一个数是否是素数

package day02;

public class Fangk{

public static void main(String[] args){

int num=14;

boolean flag=true;

for(int i=2;i<=num/2;i++){

if(num%i==0){

flag=false;

break;

}

}

if(flag){

System.out.println(num+" is a prime number!");

}else{

System.out.println(num+" is not a prime number!");

}

}

}

//////////////////////////////////////////////////////////////////////

package day04;

import java.util.Scanner;

public class A1{

public static void main(String[] args){

int n;

Scanner sca=new Scanner(System.in);

System.out.println("please input a number:");

n=sca.nextInt();

if(isPrimeNumber(n)){

System.out.println(n+"is a prime number!");

}else{

System.out.println(n+"is not a prime number!");

}

}

public static boolean isPrimeNumber(int n){ for(int i=2;i<=n/2;i++){

if(n%i==0){

return false;

}

}

return true;

}

}

13一个数倒序排列

package day02;

public class Daoxu{

public static void main(String[] args){

int olddata=3758;

int newdata=0;

while(olddata!=0){

for(int i=0;i<4;i++){

newdata=newdata*10+olddata%10;

olddata=olddata/10;

}

System.out.println("newdata="+newdata);

}

}

}

14将一个整数以二进制输出

package day04;

import java.util.Scanner;

public class ArrayTest {

public static void main(String[] args){

int n;

Scanner s=new Scanner(System.in);

System.out.println("please input a number:");

n=s.nextInt();

for(int i=31;i>=0;i--){

if((n&(1<

System.out.print("1");

}else{

System.out.print("0");

}

if((32-i)%8==0){

System.out.print(" ");

}

}

}

}

15矩形图案

package day02;

public class Fangk {

public static void main(String[] args){

int m=5,n=6;

for(int i=0;i

System.out.print("* ");

}

System.out.println();

for(int i=0;i

System.out.print("* ");

for(int j=0;j

System.out.print(" ");

}

System.out.print("*");

System.out.println();

}

for(int i=0;i

System.out.print("* ");

}

}

}

16猜数字

package day02;

import java.util.Scanner;

public class Csz {

public static void main(String[] args) {

Scanner s = new Scanner(System.in);

int num = (int) (Math.random() * 1000);

int m=0;

for(int i=9;i>=0;i--){

System.out.println("please input your number! ");

m=s.nextInt();

if(m>num){

System.out.println("Too large!");

}else if(m

System.out.println("Too small!");

}else{

System.out.println("Y ou are right!");

break;

}

if(i>0){

System.out.println("还有"+i+"次机会！");

}

}

if( m!=num){

System.out.println("下次再来吧！");

}

}

}

17.HotelManager

package hotel;

import java.util.Scanner;

public class HotelManager {

private static String[][] rooms;// 表示房间

public static void main(String[] args) {

rooms = new String[10][12];

String comm;// 表示用户输入的命令

for (int i = 0; i < rooms.length; i++) {

for (int j = 0; j < rooms[0].length; j++) {

rooms[i][j] = "EMPTY";

}

}

//

while (true) {

System.out.println("请输入命令：");

Scanner sca = new Scanner(System.in);

System.gc();

comm = sca.next();

if ("search".equalsIgnoreCase(comm)) {

search();

} else if ("in".equalsIgnoreCase(comm)) {

int roomNo = sca.nextInt();

String name = sca.next();

in(roomNo, name);

} else if ("out".equalsIgnoreCase(comm)) {

int roomNo = sca.nextInt();

out(roomNo);

} else if ("exit".equalsIgnoreCase(comm)) {

System.out.println("程序退出...");

break;

} else {

System.out.println("命令输入错误，请重新输入：");

}

}

}

private static void out(int roomNo) {

if("EMPTY".equals(rooms[(roomNo/100)-1][(roomNo%100)-1])){ System.out.println("该房间没有客人入住，退房失败！");

return;

}

rooms[(roomNo/100)-1][(roomNo%100)-1]="EMPTY";

System.out.println(roomNo+"退房成功！");

}

private static void in(int roomNo, String name) {

if(!"EMPTY".equals(rooms[(roomNo/100)-1][(roomNo%100)-1])){ System.out.println("该房间已经有客人入住！");

return;

}

rooms[(roomNo/100)-1][(roomNo%100)-1]=name;

System.out.println(name+"成功入住"+roomNo+"房间！");

}

private static void search() {

for (int i = 0; i < rooms.length; i++) {

//打印房间号

for (int j = 0; j < rooms[0].length; j++) {

if (j + 1 < 10) {

System.out.print(i + 1 + "0" + (j + 1) + " ");

} else {

System.out.print(i + 1 + "" + (j + 1) + " ");

}

}

//打印房间状态

System.out.println();

for (int j = 0; j < rooms[0].length; j++) {

System.out.print(rooms[i][j] + " ");

}

System.out.println();

}

}

}

18.StudentManager

package day05.student_manager;

import java.util.Scanner;

public class StudentManager {

static int[][] scores=new int[6][5];

static String[] students={"zhangsan","lisi","wangwu","zhaoliu","qianqi","liuba"};

static String[] courses={"corejava","jdbc","servlet","jsp","ejb"};

public static void main(String[] args) {

for(int i=0;i

for(int j=0;j

scores[i][j]=(int)(Math.random()*100);

}

}

Scanner s=new Scanner(System.in);

String comm;

while(true){

System.out.println("请输入命令：");

comm=s.next();

if(comm.equals("A VG")){

String para=s.next();

avg(para);

}else if(comm.equals("SORT")){

String course=s.next();

sort(course);

}else if(comm.equals("GET")){

String student=s.next();

String course=s.next();

get(student,course);

}else if(comm.equals("EXIT")){

break;

}else{

System.out.println("命令格式不正确，请重新输入！");

}

}

}//main() end!

public static void avg(String para){

int sIndex=-1;

int cIndex=-1;

for(int i=0;i

if(students[i].equals(para)){

sIndex=i;

}

}

if(sIndex==-1){

for(int i=0;i

if(courses[i].equals(para)){

cIndex=i;

}

}

}

if(sIndex==-1 && cIndex==-1){

System.out.println("找不到学生或课程！");

return;

}

double avg=0.0;

if(sIndex!=-1){

for(int i=0;i

avg+=scores[sIndex][i];

}

avg/=scores[sIndex].length;

System.out.println("学生："+para+"的平均分是:"+avg);

}else{

for(int i=0;i

avg+=scores[i][cIndex];

}

avg/=scores.length;

System.out.println("课程："+para+"的平均分是:"+avg);

}

}

public static void sort(String course){

int[] courseScore=new int[scores.length];

if(course.equals("sum")){//如果求总分的排名

// //求出每个学生的总分，将成绩存放在courseScore数组中for(int i=0;i

int studentSum=0;

for(int j=0;j

studentSum+=scores[i][j];

}

courseScore[i]=studentSum;

}

}else{//如果不是求总分排名

int cIndex=-1;

for(int i=0;i

cIndex=i;

}

}

if(cIndex!=-1){//如果是一门有效的课程

//把scores数组中这一列的值放到courseScore数组中！

for(int i=0;i

courseScore[i]=scores[i][cIndex];

}

}else{//如果不是一门有效的课程

System.out.println("课程名不正确，请重新输入！");

return;

}

}

String[] studentCopy=new String[students.length];

System.arraycopy(students, 0, studentCopy, 0, students.length);

for(int i=0;i

for(int j=i+1;j

if(courseScore[i]

int temp=courseScore[i];

courseScore[i]=courseScore[j];

courseScore[j]=temp;

String stemp=studentCopy[i];

studentCopy[i]=studentCopy[j];

studentCopy[j]=stemp;

}

}

}

int order=1;

System.out.println("名次\t学生\t成绩");

for(int i=0;i

if(i!=0 && courseScore[i]==courseScore[i-1]){

order--;

}else{

order=i+1;