补全代码题java java程序补充题

JAVA这个代码谁能帮我补全？

你这个至少应该有个对应的用户名和密码的集合或者数组吧，不然循环什么？具体的根据所给的数据进行循环

使用数组循环

使用集合循环

相关问答

Q1: Java程序填空题：将下面的一段代码补充完整

public void add(int a,int b){

    System.out.println(a+"+"+b+"="+(a+b));

}

public void show(){

    System.out.println("show方法执行了！");

}

Q2: 求解一道Java实验题，给出一段代码，要求把该代码补充完整使其可以运行，具体要求如下

package xinguan;

abstract class Operation{ //抽象类

public static double numberA= 0;

public static double numberB = 0;

abstract double getResult(); //抽象方法

}

class OperationADD extends Operation{

@Override

double getResult() {

return numberA+numberB;

}

}

class OperationSUB extends Operation{

@Override

double getResult() {

return numberA-numberB;

}

}

class OperationMUL extends Operation{

@Override

double getResult() {

return numberA*numberB;

}

}

class OperationDIV extends Operation{

@Override

double getResult() {

return numberA/numberB;

}

}

class OperationFactory{

public static Operation createOperate(char operate){

Operation oper = null;

switch (operate){

case'+':

oper= new OperationADD();

break;

case'-':

oper= new OperationSUB();

break;

case'*':

oper= new OperationMUL();

break;

case'/':

oper= new OperationDIV();

break;

}

return oper;

}

}

public class CalculateDemo {

/**

* @param args

*/

public static void main(String[] args) {

Operation operADD = OperationFactory.createOperate('+');

Operation operSUB = OperationFactory.createOperate('-');

Operation operMUL = OperationFactory.createOperate('*');

Operation operDIV = OperationFactory.createOperate('/');

operADD.numberA = 15.0;

operADD.numberB = 3;

System.out.println(operADD.getResult());

System.out.println(operSUB.getResult());

System.out.println(operMUL.getResult());

System.out.println(operDIV.getResult());

}

}

因为抽象类是静态方法 所以 给operADD 那个对象赋值一次就能获得所有结果。要是去掉static 那么就需要每个对象 赋值。现在基本满足你的要求了。

Q3: java 补全代码

楼主，依题意，完整的程序如下：

import java.awt.FlowLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class Exam2 extends Thread implements ActionListener

{

//声明界面元素

private JFrame timeFrame;

private JButton startButton;

private JButton stopButton;

private JButton resetButton;

private JLabel timeLabel;

//定义变量存储时、分、秒

int hour = 0;

int minute = 0;

int second = 0;

//声明线程对象

Thread myThread;

public Exam2()

{

timeFrame = new JFrame("计时器");

startButton = new JButton("开始");

stopButton = new JButton("停止");

resetButton = new JButton("重置");

timeLabel = new JLabel("00:00:00");

timeFrame.setLayout(new FlowLayout());

timeFrame.setBounds((Toolkit.getDefaultToolkit().getScreenSize().width - 300)/2,

(Toolkit.getDefaultToolkit().getScreenSize().height - 200)/2, 300, 200);

timeFrame.add(timeLabel);

timeFrame.add(startButton);

timeFrame.add(stopButton);

timeFrame.add(resetButton);

timeFrame.setVisible(true);

timeFrame.addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

startButton.addActionListener(this);

stopButton.addActionListener(this);

resetButton.addActionListener(this);

myThread = this;

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource() == this.startButton)

{

System.out.println("计时开始...");

if(this.start)

{

this.myThread.start();

}

else

{

this.start = true;

}

}

if(e.getSource() == this.stopButton)

{

System.out.println("计时停止...");

this.start = false;

}

if(e.getSource() == this.resetButton)

{

hour = 0;

minute = 0;

second = 0;

}

}

volatile boolean start = true;

@Override

public void run()

{

while(true)

{

if(this.start)

{

second++;

try

{

Thread.sleep(1000);

} catch (InterruptedException e)

{

e.printStackTrace();

}

if(second = 60)

{

second = 0;

minute++;

}

if(minute = 60)

{

minute = 0;

hour++;

}

showTime();

}

}

}

private void showTime()

{

String strTime = "";

if(hour 10)

{

strTime += "0"+hour + ":";

}

else

{

strTime += hour + ":";

}

if(minute 10)

{

strTime += "0"+minute + ":";

}

else

{

strTime += minute + ":";

}

if(second 10)

{

strTime += "0"+second;

}

else

{

strTime += second;

}

this.timeLabel.setText(strTime);

}

public static void main(String[] args)

{

new Exam2();

}

}

有问题欢迎提问，满意请采纳，谢谢！

Q4: java练习题求完整代码

按照题目要求编写的用javaBean规范设计的学生类Student的Java程序如下

需要创建user.java.test包,把Student.java文件和Test.java文件放入包中,编译Student.java文件并且编译运行Test.java文件得到运行结果

Student.java文件代码如下

package user.java.test;

import java.io.Serializable;

public class Student implements Serializable{

private static final long serialVersionUID = 1L;

private String no;

private String name;

private double score;

public Student(){}

public Student(String no,String name,double score){

this.no=no;

this.name=name;

this.score=score;

}

public String getNo(){ return no;}

public void setNo(String no){ this.no=no;}

public String getName(){ return name;}

public void setName(String name){ this.name=name;}

public double getScore(){ return score;}

public void setScore(double score){ this.score=score;}

public String toString(){

return "学号:"+no+",姓名:"+name+",成绩:"+score;

}

public static double getAvg(Student[] sArray){

double sum=0,avg;

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

sum=sum+sArray[i].getScore();

}

avg=sum/sArray.length;

return avg;

}

}

Test.java文件代码如下

package user.java.test;

public class Test{

public static void main(String[] args){

Student[] sArray=new Student[5];

sArray[0]=new Student("001","张三",89.5);

sArray[1]=new Student("002","李四",82.5);

sArray[2]=new Student("003","王五",93);

sArray[3]=new Student("004","赵六",73.5);

sArray[4]=new Student("005","孙七",66);

System.out.println("这些学生的平均分:"+Student.getAvg(sArray));

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

System.out.println(sArray[i].toString());

}

}

}

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