有一篇作业java基础的（java课后作业）

发布时间：2022-11-09

本文目录一览：

  1. java小白，自学中，我做了一道基础的java练习题，不知道正确与否，视频教学中并没有给出解答，求大神检查
  2. JAVA作业
  3. 谁能帮一下我，java选修课的作业，一题两题都可以，先谢谢了！！
  4. [Java作业求帮助 题一: 编写一个Java程序，在程序中定义一个PersonA类，定义](#Java作业求帮助 题一: 编写一个Java程序，在程序中定义一个PersonA类，定义)
  5. 请帮我做一道JAVA的作业题，很简单的，我是初学者
  6. 一个java的作业！~

java小白，自学中，我做了一道基础的java练习题，不知道正确与否，视频教学中并没有给出解答，求大神检查

看来你没有运行过啊！！！ main方法写错了，参数丢了 scanner没有实例化，就是没有new scanner方法错了，in.nextInt（）； if判断‘=’是赋值，‘==’才是判断是否相等，另外不能连等 a==b b==c 应该这样； 逻辑到是没错的，这样可以实现；如果嵌套的话，可能是让你将判断是否大于1000 写在 else{ if（sum1000）{ }else{ } }里面

JAVA作业

4 final 5 方法名称、返回值、参数签名 6 public class C extends B implements C 7 class 8 false，true，false 9 private 10 Object 11 编译时类型与运行时类型不一致，重写，重载 12 import 13 抽象方法，final修饰或者private修饰 14 aceg 判断： 1 不一定 protect修饰的 父类与子类在不同包里不能继承 2 错 3 错 4 对 5 错 6 对 更多JAVA问题，请去ITMUCH，IT木虫

谁能帮一下我，java选修课的作业，一题两题都可以，先谢谢了！！

2、类的方法与异常处理： 在一个类的main方法中定义一个长度为8的int型数组，用for循环对数组中的元素1到8的值。随机产生两个整数，将这两个整数作为数组的下标来引用数组中的元素，求出这两个元素的积，并在屏幕上输出这两个元素的值和积。要求在出现数组下标越界时，采用try-catch的方法捕获异常。

import java.util.Random;
public class SecondTest {
    public static void main(String[] args) {
        //定义一个长度为8的int型数组
        int[] ary = {35, 42, 13, 46, 59, 37, 125, 99};
        //用for循环对数组中的元素1到8的值
        for(int i= 1; i < ary.length;i++){
            System.out.print(ary[i] + "\t");
        }
        System.out.println();
        try{
            Random rand = new Random();
            //随机产生两个整数
            int first = rand.nextInt();
            int second = rand.nextInt();
            //这两个整数作为数组的下标来引用数组中的元素，求出这两个元素的积
            long mul = ary[first] * ary[second];
            //屏幕上输出这两个元素的值和积
            System.out.println("积为" + mul);
        }catch(ArrayIndexOutOfBoundsException exp){
            //出现数组下标越界时，采用try-catch的方法捕获异常
            System.out.println("数组下标越界! Error!");
        }
    }
}

、类与对象的基础题： 1）编程实现：设计一个类Simple，有三个成员变量，分别为int型、double型和String型，这三个成员变量分别含有各自的get方法和set方法，可以用toString方法显示这三个成员变量。 2）声明测试类：在测试类的main 方法中创建Simple类的对象aSimple,此对象调用set方法分别对对象的各个属性设置具体的值，然后调用get方法将aSimple的具体的值输出在屏幕上。

public class TestSimple {//测试类的
    public static void main(String[] args) {
        //创建Simple类的对象aSimple
        Simple aSimple = new Simple();
        //set方法分别对对象的各个属性设置具体的值
        aSimple.setIntValue(5);
        aSimple.setDoubleValue(123.45D);
        aSimple.setStrValue("string value for simple");
        //get方法将aSimple的具体的值输出在屏幕上
        System.out.println("int value for simple is: " + aSimple.getIntValue());
        System.out.println("double value for simple is: " + aSimple.getDoubleValue());
        System.out.println("String value for simple is: " + aSimple.getStrValue());
    }
}
class Simple{//类Simple
    private int intValue;//int型成员变量
    private double doubleValue;//double型成员变量
    private String strValue;//String型成员变量
    //用toString方法显示这三个成员变量
    public String toString(){
        return intValue + ", " + doubleValue + ", " + strValue;
    }
    public double getDoubleValue() {
        return doubleValue;
    }
    public void setDoubleValue(double doubleValue) {
        this.doubleValue = doubleValue;
    }
    public int getIntValue() {
        return intValue;
    }
    public void setIntValue(int intValue) {
        this.intValue = intValue;
    }
    public String getStrValue() {
        return strValue;
    }
    public void setStrValue(String strValue) {
        this.strValue = strValue;
    }
}

Java作业求帮助 题一: 编写一个Java程序，在程序中定义一个PersonA类，定义

代码1：extends PersonA 代码2：s1.setName("张三"); 代码3：s1.setDepartment("计算机系"); 代码4：System.out.println(s1.getName()); 代码5：System.out.println(s1.getDepartment()); 注意，后四句最后的分号别落下了

请帮我做一道JAVA的作业题，很简单的，我是初学者

package jisuanqi;
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.BorderFactory;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JTextField;
import javax.swing.*;
/**
* pTitle: 
*
* pDescription: 
*
* pCopyright: Copyright (c) 2007
*
* pCompany: 
*
* @author not attributable
* @version 1.0
*/
public class Jisuan extends JFrame {
    JPanel contentPane;
    JButton btnmultiply = new JButton();
    JButton btn3 = new JButton();
    JButton btndivide = new JButton();
    JButton btn2 = new JButton();
    JButton btn5 = new JButton();
    JButton btn0 = new JButton();
    JButton btnclear = new JButton();
    JButton btnequal = new JButton();
    JButton btn1 = new JButton();
    JButton btn6 = new JButton();
    JButton bntplus = new JButton();
    JButton btnminus = new JButton();
    JButton btn4 = new JButton();
    JButton btn9 = new JButton();
    JButton btn8 = new JButton();
    JButton btn7 = new JButton();
    JPanel jPanel1 = new JPanel();
    JTextField txt = new JTextField();
    boolean flag=false;
    String operand1;
    String operand2;
    double result;
    String action;
    public Jisuan() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
    /**
    * Component initialization.
    *
    * @throws java.lang.Exception
    */
    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(null);
        setSize(new Dimension(300, 400));
        setTitle("Frame Title");
        btnmultiply.setBounds(new Rectangle(227, 322, 42, 35));
        btnmultiply.setText("+");
        btnmultiply.addActionListener(new Jisuan_jButton1_actionAdapter(this));
        contentPane.setBorder(BorderFactory.createEtchedBorder());
        contentPane.setToolTipText("");
        btn3.setBounds(new Rectangle(160, 263, 42, 35));
        btn3.setText("3");
        btn3.addActionListener(new Jisuan_btn3_actionAdapter(this));
        btndivide.setBounds(new Rectangle(227, 263, 42, 35));
        btndivide.setText("-");
        btndivide.addActionListener(new Jisuan_jButton3_actionAdapter(this));
        btn2.setBounds(new Rectangle(93, 263, 42, 35));
        btn2.setText("2");
        btn2.addActionListener(new Jisuan_btn2_actionAdapter(this));
        btn5.setBounds(new Rectangle(93, 201, 42, 35));
        btn5.setText("5");
        btn5.addActionListener(new Jisuan_btn5_actionAdapter(this));
        btn0.setBounds(new Rectangle(25, 322, 42, 35));
        btn0.setText("0");
        btn0.addActionListener(new Jisuan_btn0_actionAdapter(this));
        btnclear.setBounds(new Rectangle(93, 322, 42, 35));
        btnclear.setText("c");
        btnclear.addActionListener(new Jisuan_jButton7_actionAdapter(this));
        btnequal.setBounds(new Rectangle(160, 322, 42, 35));
        btnequal.setText("=");
        btnequal.addActionListener(new Jisuan_btnequal_actionAdapter(this));
        btn1.setBounds(new Rectangle(25, 263, 42, 35));
        btn1.setText("1");
        btn1.addActionListener(new Jisuan_btn1_actionAdapter(this));
        btn6.setBounds(new Rectangle(93, 201, 42, 35));
        btn6.setText("6");
        btn6.addActionListener(new Jisuan_btn6_actionAdapter(this));
        bntplus.setBounds(new Rectangle(227, 201, 42, 35));
        bntplus.setText("*");
        bntplus.addActionListener(new Jisuan_btnminus_actionAdapter(this));
        btnminus.setBounds(new Rectangle(227, 137, 42, 35));
        btnminus.setText("/");
        btnminus.addActionListener(new Jisuan_bntplus_actionAdapter(this));
        btn4.setBounds(new Rectangle(25, 201, 42, 35));
        btn4.setText("4");
        btn4.addActionListener(new Jisuan_btn4_actionAdapter(this));
        btn9.setBounds(new Rectangle(160, 137, 42, 35));
        btn9.setText("9");
        btn9.addActionListener(new Jisuan_btn9_actionAdapter(this));
        btn8.setBounds(new Rectangle(93, 137, 42, 35));
        btn8.setText("8");
        btn8.addActionListener(new Jisuan_btn8_actionAdapter(this));
        btn7.setBounds(new Rectangle(25, 137, 42, 35));
        btn7.setText("7");
        btn7.addActionListener(new Jisuan_btn7_actionAdapter(this));
        jPanel1.setBorder(BorderFactory.createEtchedBorder());
        jPanel1.setBounds(new Rectangle(13, 128, 270, 244));
        txt.setHorizontalAlignment(SwingConstants.RIGHT);
        txt.setBounds(new Rectangle(13, 61, 270, 46));
        contentPane.add(btndivide);
        contentPane.add(btn3);
        contentPane.add(btn2);
        contentPane.add(btnclear);
        contentPane.add(btnmultiply, null);
        contentPane.add(btnequal);
        contentPane.add(btn1);
        contentPane.add(btn0);
        contentPane.add(btn5);
        contentPane.add(btn6);
        contentPane.add(bntplus);
        contentPane.add(btn4);
        contentPane.add(btn7);
        contentPane.add(btn8);
        contentPane.add(btn9);
        contentPane.add(btnminus);
        contentPane.add(jPanel1);
        contentPane.add(txt);
    }
    public void jButton1_actionPerformed(ActionEvent e) {
        action="plus";
        operand1=txt.getText();
        txt.setText("");
        flag=true;
    }
    public void jButton3_actionPerformed(ActionEvent e) {
        action="minus";
        operand1=txt.getText();
        txt.setText("");
        flag=true;
    }
    public void btn1_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn1.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn1.getActionCommand());
        }
    }
    public void btn6_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn6.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn6.getActionCommand());
        }
    }
    public void btn2_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn2.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn2.getActionCommand());
        }
    }
    public void btn3_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn3.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn3.getActionCommand());
        }
    }
    public void btn4_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn4.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn4.getActionCommand());
        }
    }
    public void btn5_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn5.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn5.getActionCommand());
        }
    }
    public void btn7_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn7.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn7.getActionCommand());
        }
    }
    public void btn8_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn8.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn8.getActionCommand());
        }
    }
    public void btn9_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn9.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn9.getActionCommand());
        }
    }
    public void btn0_actionPerformed(ActionEvent e) {
        if(flag){
            txt.setText(btn0.getActionCommand());
            flag=false;
        }
        else{
            txt.setText(txt.getText()+btn0.getActionCommand());
        }
    }
    public void jButton7_actionPerformed(ActionEvent e) {
        txt.setText("");
    }
    public void bntplus_actionPerformed(ActionEvent e) {
        action="divide";
        operand1=txt.getText();
        txt.setText("");
        flag=true;
    }
    public void btnminus_actionPerformed(ActionEvent e) {
        action="multiply";
        operand1=txt.getText();
        txt.setText("");
        flag=true;
    }
    public void btnequal_actionPerformed(ActionEvent e) {
        double digit1;
        double digit2;
        operand2=txt.getText();
        if(flag==false){
            if(action.equals("divide")){
                digit1=Integer.parseInt(operand1);
                digit2=Integer.parseInt(operand2);
                result=digit1 / digit2;
                txt.setText(new Double(result).toString());
                flag=true;
            }else if(action.equals("plus")){
                digit1=Integer.parseInt(operand1);
                digit2=Integer.parseInt(operand2);
                result=digit1 + digit2;
                txt.setText(""+(int)result);
                flag=true;
            }else if(action.equals("multiply")){
                digit1=Integer.parseInt(operand1);
                digit2=Integer.parseInt(operand2);
                result=digit1 * digit2;
                txt.setText(""+(int)result);
                flag=true;
            }else if(action.equals("minus")){
                digit1=Integer.parseInt(operand1);
                digit2=Integer.parseInt(operand2);
                result=digit1-digit2;
                txt.setText(""+(int)result);
                flag=true;
            }
        }
    }
}
class Jisuan_btnminus_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btnminus_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btnminus_actionPerformed(e);
    }
}
class Jisuan_bntplus_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_bntplus_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.bntplus_actionPerformed(e);
    }
}
class Jisuan_jButton7_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_jButton7_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.jButton7_actionPerformed(e);
    }
}
class Jisuan_btn0_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn0_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn0_actionPerformed(e);
    }
}
class Jisuan_btn9_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn9_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn9_actionPerformed(e);
    }
}
class Jisuan_btn8_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn8_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn8_actionPerformed(e);
    }
}
class Jisuan_btn7_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn7_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn7_actionPerformed(e);
    }
}
class Jisuan_btn6_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn6_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn6_actionPerformed(e);
    }
}
class Jisuan_btn5_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn5_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn5_actionPerformed(e);
    }
}
class Jisuan_btn4_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn4_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn4_actionPerformed(e);
    }
}
class Jisuan_btn3_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn3_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn3_actionPerformed(e);
    }
}
class Jisuan_btn2_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn2_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn2_actionPerformed(e);
    }
}
class Jisuan_btn1_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btn1_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btn1_actionPerformed(e);
    }
}
class Jisuan_jButton3_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_jButton3_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.jButton3_actionPerformed(e);
    }
}
class Jisuan_jButton1_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_jButton1_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.jButton1_actionPerformed(e);
    }
}
class Jisuan_btnequal_actionAdapter implements ActionListener {
    private Jisuan adaptee;
    Jisuan_btnequal_actionAdapter(Jisuan adaptee) {
        this.adaptee = adaptee;
    }
    public void actionPerformed(ActionEvent e) {
        adaptee.btnequal_actionPerformed(e);
    }
}

这个是实现的方法，按钮的名字不一定一样，最主要是这个要一样 action="minus"; 一点都不简单 很长啊

一个java的作业！~

import java.lang.Math;
//a+bx+cx^2=y
public class func(double a1,double b1,double c1,double x1){
    double a=a1;idouble b=b1;double c=c1;double x=x1;idouble y=0;
    public void function(double a,double b,double x){
        if((b^2-4*a*c)0.0)
            printf("没有实根");
        double x1=-(b/2a)+Math.sqrt(b^2-4*a*c)/2a;
        double x2=-(b/2a)-Math.sqrt(b^2-4*a*c)/2a;
        printf("根为x1=%d,x2=%d",x1,x2);
    }
}
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