一個(gè)簡(jiǎn)單的Java程序代碼？

package com.zpp;public class Charge {

創(chuàng)新互聯(lián)服務(wù)項(xiàng)目包括寶山網(wǎng)站建設(shè)、寶山網(wǎng)站制作、寶山網(wǎng)頁(yè)制作以及寶山網(wǎng)絡(luò)營(yíng)銷策劃等。多年來(lái)，我們專注于互聯(lián)網(wǎng)行業(yè)，利用自身積累的技術(shù)優(yōu)勢(shì)、行業(yè)經(jīng)驗(yàn)、深度合作伙伴關(guān)系等，向廣大中小型企業(yè)、政府機(jī)構(gòu)等提供互聯(lián)網(wǎng)行業(yè)的解決方案，寶山網(wǎng)站推廣取得了明顯的社會(huì)效益與經(jīng)濟(jì)效益。目前，我們服務(wù)的客戶以成都為中心已經(jīng)輻射到寶山省份的部分城市，未來(lái)相信會(huì)繼續(xù)擴(kuò)大服務(wù)區(qū)域并繼續(xù)獲得客戶的支持與信任！

public static void main(String [] args) {

if(args.length ==0) {

System.out.println("parameter error!");

System.out.println("java com.zpp.Charge [int]");

return;

}

int min = Integer.parseInt(args[0]);

double money = 0.0;

if (min = 0) {

money =0.0;

System.out.println("not money");

} else if (min = 60) {

money = 2.0;

} else {

money = 2.0 + (min - 60) * 0.01;

}

System.out.println("please pay: " + money);

}

} 編譯：javac -d . Charge.java運(yùn)行：java com.zpp.Charge 111

Java程序代碼

import java.awt.*;//計(jì)算器實(shí)例

import java.awt.event.*;

public class calculator

{

public static void main(String args[])

{

MyWindow my=new MyWindow("計(jì)算器");

}

}

class MyWindow extends Frame implements ActionListener

{ StringBuffer m=new StringBuffer();

int p;

TextField tex;

Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,jia,jian,cheng,chu,deng,dian,qingling,kaifang;

MyWindow(String s)

{

super(s);

//StringBuffer s2=new StringBuffer();

//String s;

tex=new TextField(18);

b0=new Button(" 0 ");

b1=new Button(" 1 ");

b2=new Button(" 2 ");

b3=new Button(" 3 ");

b4=new Button(" 4 ");

b5=new Button(" 5 ");

b6=new Button(" 6 ");

b7=new Button(" 7 ");

b8=new Button(" 8 ");

b9=new Button(" 9 ");

dian=new Button(" . ");

jia=new Button(" + ");

jian=new Button(" - ");

cheng=new Button(" × ");

chu=new Button(" / ");

deng=new Button(" = ");

qingling=new Button(" 清零 ");

kaifang=new Button(" √ ");

setLayout(new FlowLayout());

add(tex);

add(b0);

add(b1);

add(b2);

add(b3);

add(b4);

add(b5);

add(b6);

add(b7);

add(b8);

add(b9);

add(dian);

add(jia);

add(jian);

add(cheng);

add(chu);

add(kaifang);

add(qingling);

add(deng);

b0.addActionListener(this);

b1.addActionListener(this);

b2.addActionListener(this);

b3.addActionListener(this);

b4.addActionListener(this);

b5.addActionListener(this);

b6.addActionListener(this);

b7.addActionListener(this);

b8.addActionListener(this);

b9.addActionListener(this);

jia.addActionListener(this);

jian.addActionListener(this);

cheng.addActionListener(this);

chu.addActionListener(this);

dian.addActionListener(this);

deng.addActionListener(this);

qingling.addActionListener(this);

kaifang.addActionListener(this);

setBounds(200,200,160,280);

setResizable(false);//不可改變大小

setVisible(true);

validate();

addWindowListener(new WindowAdapter()

{ public void windowClosing(WindowEvent ee)

{ System.exit(0);

}

});

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==b0)

{

m=m.append("0");

tex.setText(String.valueOf(m));

}

if(e.getSource()==b1)

{

m=m.append("1"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b2)

{

m=m.append("2"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b3)

{

m=m.append("3"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b4)

{

m=m.append("4"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b5)

{

m=m.append("5"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b6)

{

m=m.append("6"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b7)

{

m=m.append("7"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b8)

{

m=m.append("8"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b9)

{

m=m.append("9"); tex.setText(String.valueOf(m));

}

if(e.getSource()==jia)

{

m=m.append("+"); tex.setText(String.valueOf(m));

}

if(e.getSource()==jian)

{

m=m.append("-"); tex.setText(String.valueOf(m));

}

if(e.getSource()==cheng)

{

m=m.append("*"); tex.setText(String.valueOf(m));

}

if(e.getSource()==chu)

{

m=m.append("/"); tex.setText(String.valueOf(m));

}

if(e.getSource()==dian)

{

m=m.append("."); tex.setText(String.valueOf(m));

}

String mm=String.valueOf(m);

int p1=mm.indexOf("+");

int p2=mm.indexOf("-");

int p3=mm.indexOf("*");

int p4=mm.indexOf("/");

if(p1!=-1)

{

p=p1;

}

else if(p3!=-1)

{

p=p3;

}

else if(p2!=-1)

{

p=p2;

}

else if(p4!=-1)

{

p=p4;

}

if(e.getSource()==deng)

{

String m1=mm.substring(0,p);

String m2=mm.substring(p+1);

String ch=mm.substring(p,p+1);

//System.out.println(m1);

//System.out.println(m2);

//System.out.println(ch);

if(ch.equals("+"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1+n2;

String su=String.valueOf(sum);

tex.setText(su);

}

if(ch.equals("-"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1-n2;

String su=String.valueOf(sum);

tex.setText(su);

}

if(ch.equals("*"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1*n2;

String su=String.valueOf(sum);

tex.setText(su);

}

if(ch.equals("/"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1/n2;

String su=String.valueOf(sum);

tex.setText(su);

}

}

if(e.getSource()==qingling)

{StringBuffer kk=new StringBuffer();

m=kk;

tex.setText("0");

// System.out.println(mm);

}

if(e.getSource()==kaifang)

{

String t=tex.getText();

float num=Float.parseFloat(t);

double nub=Math.sqrt(num);

tex.setText(String.valueOf(nub));

}

}

}

Java的基本格式

基本格式：修飾符 class 類名（程序代碼）

意義：Java中的程序代碼都必須放在一個(gè)類中，對(duì)于類初學(xué)者可以簡(jiǎn)單地把它理解為一個(gè)java程序；類需要使用class作為關(guān)鍵字定義；而在class的前面可以有一些修飾符。

擴(kuò)展資料

編寫java時(shí)，特別需要注意的幾個(gè)書寫格式常見的錯(cuò)誤：

1.java中的程序代碼中功能執(zhí)行語(yǔ)句的最后都必須用（;）結(jié)束。

這里需要注意的是，在程序中不要將英文的分號(hào)（;）誤寫成中文的分號(hào)（；） ，如果寫成了中文的分號(hào)，編譯器會(huì)報(bào)告“Invalid character”（無(wú)效字符）這樣的錯(cuò)誤信息。

2.Java語(yǔ)言是嚴(yán)格區(qū)分大小寫的。在定義類時(shí)，不能將class寫成Class，否則編譯會(huì)報(bào)錯(cuò)。程序中定義一個(gè)computer的同時(shí)，還可以定義一個(gè)Computer，computer和Computer是兩個(gè)全完不同的符號(hào)，在使用的時(shí)候需要注意。

3. 在編寫java代碼的時(shí)候?yàn)榱吮阌陂喿x，通常會(huì)使用一種良好的格式進(jìn)行排版，但這并不是必須的，我們也可以在兩個(gè)單詞或者符號(hào)之間任意換行。

參考資料：百度百科-java

簡(jiǎn)單的JAVA的程序代碼的意思？

意思是把x和y轉(zhuǎn)換成字符串輸出。

當(dāng)x=0，y=0時(shí)，輸出

0 0（空格）

當(dāng)x=1，y=0時(shí)，輸出

0 0 0 1（空格）

所以，最后輸出就是：

0 0 0 1 0 2 0 3 0 4（最后還有一個(gè)空格）

用java編寫下圖的程序，詳細(xì)程序代碼

我使用eclipse寫的這個(gè)練習(xí)，首先給你截個(gè)圖，抹掉的地方不是這個(gè)題的范疇，光標(biāo)擋住的地方是ModelScore

然后，先是ModelScore代碼：

package?Models;

public?class?ModelScore?{

private?double?mathScore;

private?double?englishScore;

private?double?javaScore;

private?static?final?int?type_Math?=?0,?type_English?=?1,?type_Java?=?2;

public?ModelScore(){

}

public?int?getNumberOfField(){

return?3;

}

public?ModelScore(double?mathScore,?double?englishScore,?double?javaScore){

this.mathScore?=?mathScore;

this.englishScore?=?englishScore;

this.javaScore?=?javaScore;

}

public?double?getMathScore(){

return?this.mathScore;

}

public?double?getEnglishScore(){

return?this.englishScore;

}

public?double?getJavaScore(){

return?this.javaScore;

}

public?void?setMathScore(double?mathScore){

this.mathScore?=?mathScore;

}

public?void?setEnglishScore(double?englishScore){

this.englishScore?=?englishScore;

}

public?void?setJavaScore(double?javaScore){

this.javaScore?=?javaScore;

}

public?double?getAverageScore(){

return?(double)Math.round((this.mathScore?+?this.englishScore?+?this.javaScore)?/?3?*?100)?/?100;

}

public?String?toString(){

return?"Scores:[Math:?"?+?getMathScore()?+?

",?English:?"?+?getEnglishScore()?+?",?Java:?"?+?getJavaScore()?+?

",?AverageScore:?"?+?getAverageScore()?+?"]";

}

public?ModelScore?clone(){

ModelScore?score?=?new?ModelScore();

score.setMathScore(this.getMathScore());

score.setEnglishScore(this.getEnglishScore());

score.setJavaScore(this.getJavaScore());

return?score;

}

public?double?getScore(int?type){

if(type?==?type_Math){

return?mathScore;

}

if(type?==?type_English){

return?englishScore;

}

if(type?==?type_Java){

return?javaScore;

}

return?0;

}

}

然后是ModelStudent代碼：

package?Models;

public?class?ModelStudent?{

private?String?studentID;

private?String?studentName;

private?ModelScore?score;

public?ModelStudent(){

}

public?ModelStudent(String?studentID,?String?studentName,?ModelScore?score){

this.studentID?=?studentID;

this.studentName?=?studentName;

this.score?=?score.clone();

}

public?String?getStudentID(){

return?this.studentID;

}

public?String?getStudentName(){

return?this.studentName;

}

public?ModelScore?getStudentScore(){

return?this.score.clone();

}

public?void?setStudentID(String?studentID){

this.studentID?=?studentID;

}

public?void?setStudentName(String?studentName){

this.studentName?=?studentName;

}

public?void?setStudentScore(ModelScore?score){

this.score?=?score.clone();

}

public?double?getAverageScore(){

return?score.getAverageScore();

}

public?ModelStudent?clone(){

ModelStudent?student?=?new?ModelStudent();

student.setStudentID(studentID);

student.setStudentName(studentName);

student.setStudentScore(score.clone());

return?student;

}

public?String?toString(){

return?"Student:[?ID:?"?+?getStudentID()?+?",?Name:?"

+?getStudentName()?+?",?"?+?getStudentScore()?+?"]";

}

public?String?getNameAndEverayScore(){

return?"Name:?"?+?studentName?+?",?average?score:?"?+?getAverageScore();

}

}

最后是主函數(shù)所在的類StudentScoreTester代碼：

import?java.util.ArrayList;

import?java.util.Scanner;

import?Models.ModelScore;

import?Models.ModelStudent;

public?class?StudentScoreTester?{

static?final?int?type_Math?=?0,?type_English?=?1,?type_Java?=?2?;

public?static?void?main(String[]?args)?throws?NumberFormatException{

Scanner?input?=?new?Scanner(System.in);

String?studentID?=?"?",?studentName,?searchedStudentName;

double?studentMathScore,?studentEnglishScore,?studentJavaScore;

ModelScore?studentScore;

ModelStudent?student;

ArrayListModelStudent?students?=?new?ArrayListModelStudent();

ArrayListModelStudent?studentsWithMaxMath,?studentsWithMinMath;

ArrayListModelStudent?studentsWithMaxEnglish,?studentsWithMinEnglish;

ArrayListModelStudent?studentsWithMaxJava,?studentsWithMinJava;

ArrayListModelStudent?searchedStudents;

double[]?averageScores;

double?averageScoreForMath,?averageScoreForEnglish,?averageScoreForJava;

double?maxScoreForMath,?maxScoreForEnglish,?maxScoreForJava;

double?minScoreForMath,?minScoreForEnglish,?minScoreForJava;

while(!studentID.equalsIgnoreCase("end")){

System.out.print("輸入若干學(xué)生的學(xué)號(hào)，姓名，以及三科成績(jī)（數(shù)學(xué)，英語(yǔ)，Java），?以輸入end作為結(jié)束輸入：");

studentID?=?input.next();

if(studentID.equalsIgnoreCase("end")){

break;

}

studentName?=?input.next();

studentMathScore?=?Double.valueOf(input.next());

studentEnglishScore?=?Double.valueOf(input.next());

studentJavaScore?=?Double.valueOf(input.next());

studentScore?=?new?ModelScore(studentMathScore,?studentEnglishScore,?studentJavaScore);

student?=?new?ModelStudent(studentID,?studentName,?studentScore);

students.add(student);

}

System.out.println("*******************************");

System.out.println("計(jì)算出所有學(xué)生平均成績(jī)，并以降序顯示......");

sortByAverageScore(students);

for(ModelStudent?everyStudent:?students){

System.out.println(everyStudent.getNameAndEverayScore());

}

System.out.println("*******************************");

System.out.println("全組每科平均成績(jī)......");

averageScores?=?calculateAverageScore(students);

averageScoreForMath?=?averageScores[type_Math];

averageScoreForEnglish?=?averageScores[type_English];

averageScoreForJava?=?averageScores[type_Java];

System.out.println("數(shù)學(xué)：?"?+?averageScoreForMath);

System.out.println("英語(yǔ)：?"?+?averageScoreForEnglish);

System.out.println("Java：?"?+?averageScoreForJava);

System.out.println("*******************************");

System.out.println("每科最好以及最差成績(jī)的學(xué)生......");

studentsWithMaxMath?=?findStudentWithMaxScore(students,?type_Math);

studentsWithMinMath?=?findStudentWithMinScore(students,?type_Math);

studentsWithMaxEnglish?=?findStudentWithMaxScore(students,?type_English);

studentsWithMinEnglish?=?findStudentWithMinScore(students,?type_English);

studentsWithMaxJava?=?findStudentWithMaxScore(students,?type_Java);

studentsWithMinJava?=?findStudentWithMinScore(students,?type_Java);

System.out.println("??????#########################");

System.out.println("數(shù)學(xué)最高成績(jī)......");

for(ModelStudent?studentWithMaxMath:?studentsWithMaxMath){

System.out.println(studentWithMaxMath.getStudentName()?+?",?"?+?studentWithMaxMath.getStudentScore().getScore(type_Math));

}

System.out.println("\n數(shù)學(xué)最低成績(jī)......");

for(ModelStudent?studentWithMinMath:?studentsWithMinMath){

System.out.println(studentWithMinMath.getStudentName()?+?",?"?+?studentWithMinMath.getStudentScore().getScore(type_Math));

}

System.out.println("??????#########################");

System.out.println("英語(yǔ)最高成績(jī)......");

for(ModelStudent?studentWithMaxEnglish:?studentsWithMaxEnglish){

System.out.println(studentWithMaxEnglish.getStudentName()?+?",?"?+?studentWithMaxEnglish.getStudentScore().getScore(type_English));

}

System.out.println("\n英語(yǔ)最低成績(jī)......");

for(ModelStudent?studentWithMinEnglish:?studentsWithMinEnglish){

System.out.println(studentWithMinEnglish.getStudentName()?+?",?"?+?studentWithMinEnglish.getStudentScore().getScore(type_English));

}

System.out.println("??????#########################");

System.out.println("Java最高成績(jī)......");

for(ModelStudent?studentWithMaxJava:?studentsWithMaxJava){

System.out.println(studentWithMaxJava.getStudentName()?+?",?"?+?studentWithMaxJava.getStudentScore().getScore(type_Java));

}

System.out.println("\nJava最低成績(jī)......");

for(ModelStudent?studentWithMinJava:?studentsWithMinJava){

System.out.println(studentWithMinJava.getStudentName()?+?",?"?+?studentWithMinJava.getStudentScore().getScore(type_Java));

}

System.out.println("*******************************");

System.out.print("輸入要查找的學(xué)生姓名：?");

input.nextLine();

searchedStudentName?=?input.nextLine();

searchedStudents?=?searchStudentsByName(students,?searchedStudentName);

System.out.println("查找結(jié)果是......");

if(searchedStudents.size()?!=?0){

for(ModelStudent?everyStudent:?searchedStudents){

System.out.println(everyStudent);

}

}

else{

System.out.println("查無(wú)此學(xué)生");

}

}

public?static?void?sortByAverageScore(ArrayListModelStudent?students){

for(int?i?=?0;?i??students.size()?-?1;?i++){

for(int?j?=?i;?j??students.size();?j++){

if(students.get(i).getAverageScore()??students.get(j).getAverageScore()){

ModelStudent?tempStudent?=?students.get(i);

students.set(i,?students.get(j));

students.set(j,?tempStudent);

}

}

}

}

public?static?double[]?calculateAverageScore(ArrayListModelStudent?students){

double[]?averageScore?=?new?double[students.get(0).getStudentScore().getNumberOfField()];

for(int?i?=?0;?i??students.size();?i++){

ModelStudent?currentStudent?=?students.get(i);

averageScore[type_Math]?+=?currentStudent.getStudentScore().getMathScore();

averageScore[type_English]?+=?currentStudent.getStudentScore().getEnglishScore();

averageScore[type_Java]?+=?currentStudent.getStudentScore().getJavaScore();

}

averageScore[type_Math]?=?(double)Math.round(averageScore[type_Math]/?students.size()?*?100)?/?100;

averageScore[type_English]?=?(double)Math.round(averageScore[type_English]/?students.size()?*?100)?/?100;

averageScore[type_Java]?=?(double)Math.round(averageScore[type_Java]/?students.size()?*?100)?/?100;

return?averageScore;

}

public?static?ArrayListModelStudent?findStudentWithMaxScore(ArrayListModelStudent?students,?int?type){

ArrayListModelStudent?studentsWithMaxScore?=?new?ArrayListModelStudent();

ModelStudent?studentWithMaxScore?=?students.get(0);

for(ModelStudent?everyStudent:?students){

if(studentWithMaxScore.getStudentScore().getScore(type)??everyStudent.getStudentScore().getScore(type)){

studentWithMaxScore?=?everyStudent.clone();

}

}

for(ModelStudent?everyStudent:?students){

if(studentWithMaxScore.getStudentScore().getScore(type)?==?everyStudent.getStudentScore().getScore(type)){

studentsWithMaxScore.add(everyStudent);

}

}

return?studentsWithMaxScore;

}

public?static?ArrayListModelStudent?findStudentWithMinScore(ArrayListModelStudent?students,?int?type){

ArrayListModelStudent?studentsWithMaxScore?=?new?ArrayListModelStudent();

ModelStudent?studentWithMaxScore?=?students.get(0);

for(ModelStudent?everyStudent:?students){

if(studentWithMaxScore.getStudentScore().getScore(type)??everyStudent.getStudentScore().getScore(type)){

studentWithMaxScore?=?everyStudent.clone();

}

}

for(ModelStudent?everyStudent:?students){

if(studentWithMaxScore.getStudentScore().getScore(type)?==?everyStudent.getStudentScore().getScore(type)){

studentsWithMaxScore.add(everyStudent);

}

}

return?studentsWithMaxScore;

}

public?static?ArrayListModelStudent?searchStudentsByName(ArrayListModelStudent?students,?String?studentName){

ArrayListModelStudent?resultStudents?=?new?ArrayListModelStudent();

for(ModelStudent?everyStudent:?students){

if(everyStudent.getStudentName().equals(studentName)){

resultStudents.add(everyStudent);

}

}

return?resultStudents;

}

}

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