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java中的程序代码中心,代码JAVA

一个简单的Java程序代码?

package com.zpp;public class Charge {

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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);

}

} 编译:javac -d . Charge.java运行:java com.zpp.Charge 111

Java程序代码

import java.awt.*;//计算器实例

import java.awt.event.*;

public class calculator

{

public static void main(String args[])

{

MyWindow my=new MyWindow("计算器");

}

}

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);//不可改变大小

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:修饰符 class 类名(程序代码)

意义:Java中的程序代码都必须放在一个类中,对于类初学者可以简单地把它理解为一个java程序;类需要使用class作为关键字定义;而在class的前面可以有一些修饰符。

扩展资料

编写java时,特别需要注意的几个书写格式常见的错误:

1.java中的程序代码中功能执行语句的最后都必须用(;)结束。

这里需要注意的是,在程序中不要将英文的分号(;)误写成中文的分号(;) ,如果写成了中文的分号,编译器会报告“Invalid character”(无效字符)这样的错误信息。

2.Java语言是严格区分大小写的。在定义类时,不能将class写成Class,否则编译会报错。程序中定义一个computer的同时,还可以定义一个Computer,computer和Computer是两个全完不同的符号,在使用的时候需要注意。

3. 在编写java代码的时候为了便于阅读,通常会使用一种良好的格式进行排版,但这并不是必须的,我们也可以在两个单词或者符号之间任意换行。

参考资料:百度百科-java

简单的JAVA的程序代码的意思?

意思是把x和y转换成字符串输出。

当x=0,y=0时,输出

0 0(空格)

当x=1,y=0时,输出

0 0 0 1(空格)

所以,最后输出就是:

0 0 0 1 0 2 0 3 0 4(最后还有一个空格)

用java编写下图的程序,详细程序代码

我使用eclipse写的这个练习,首先给你截个图,抹掉的地方不是这个题的范畴,光标挡住的地方是ModelScore

然后,先是ModelScore代码:

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代码:

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();

}

}

最后是主函数所在的类StudentScoreTester代码:

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("输入若干学生的学号,姓名,以及三科成绩(数学,英语,Java), 以输入end作为结束输入:");

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("计算出所有学生平均成绩,并以降序显示......");

sortByAverageScore(students);

for(ModelStudent everyStudent: students){

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

}

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

System.out.println("全组每科平均成绩......");

averageScores = calculateAverageScore(students);

averageScoreForMath = averageScores[type_Math];

averageScoreForEnglish = averageScores[type_English];

averageScoreForJava = averageScores[type_Java];

System.out.println("数学: " + averageScoreForMath);

System.out.println("英语: " + averageScoreForEnglish);

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

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

System.out.println("每科最好以及最差成绩的学生......");

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("数学最高成绩......");

for(ModelStudent studentWithMaxMath: studentsWithMaxMath){

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

}

System.out.println("\n数学最低成绩......");

for(ModelStudent studentWithMinMath: studentsWithMinMath){

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

}

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

System.out.println("英语最高成绩......");

for(ModelStudent studentWithMaxEnglish: studentsWithMaxEnglish){

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

}

System.out.println("\n英语最低成绩......");

for(ModelStudent studentWithMinEnglish: studentsWithMinEnglish){

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

}

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

System.out.println("Java最高成绩......");

for(ModelStudent studentWithMaxJava: studentsWithMaxJava){

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

}

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

for(ModelStudent studentWithMinJava: studentsWithMinJava){

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

}

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

System.out.print("输入要查找的学生姓名: ");

input.nextLine();

searchedStudentName = input.nextLine();

searchedStudents = searchStudentsByName(students, searchedStudentName);

System.out.println("查找结果是......");

if(searchedStudents.size() != 0){

for(ModelStudent everyStudent: searchedStudents){

System.out.println(everyStudent);

}

}

else{

System.out.println("查无此学生");

}

}

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;

}

}


文章题目:java中的程序代码中心,代码JAVA
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