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纯手打，2.（3）没搞清那个命令行是什么意思，所以没写
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package student;
public class Student {
private String college;
private String major;
private String classes;
private String name;
private int oop;
private int network;
private int sql;
private int sum;
//无参构造函数
public Student(){}
//有参构造函数
public Student( String college,
String major, String classes,
String name, int oop, int network,
int sql) {
super();
this.college = college;
this.major = major;
this.classes = classes;
this.name = name;
this.oop = oop;
this.network = network;
this.sql = sql;
}
//成员方法
public int sum(){
return oop+network+sql;
}
//getter,setter方法
public String getCollege() {
return college;
}
public void setCollege(String college) {
this.college = college;
}
public String getMajor() {
return major;
}
public void setMajor(String major) {
this.major = major;
}
public String getClasses() {
return classes;
}
public void setClasses(String classes) {
this.classes = classes;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getOop() {
return oop;
}
public void setOop(int oop) {
this.oop = oop;
}
public int getNetwork() {
return network;
}
public void setNetwork(int network) {
this.network = network;
}
public int getSql() {
return sql;
}
public void setSql(int sql) {
this.sql = sql;
}
//toString方法
@Override
public String toString() {
return "姓名："+getName()+" "+"学院："+getCollege()+" "+"专业："+getMajor()
+" "+"班级"+getClasses()+" "+"总成绩："+sum();
}
}
//测试类
package student;
import java.util.Scanner;
public class MyStudent {
public static void main(String[] args) {
//2.(1)
Student s=new Student();
s.setName("张三");
s.setCollege("南大");
s.setMajor("软件技术");
s.setClasses("软件1班");
s.setOop(89);
s.setNetwork(86);
s.setSql(99);
System.out.println(s);
System.out.println("------------------------------------"
+ "--------------------------------------");
//2.(2)
Student s1=new Student("南大","软件技术","软件1班","李四", 88,98, 91);
System.out.println(s1);
System.out.println("-------------------------------"
+ "-----------------------------------------");
//2.(3)
Scanner a=new Scanner(System.in);
System.out.println("请输入学院：");
String college=a.next();
System.out.println("请输入专业：");
String major=a.next();
System.out.println("请输入班级：");
String classes=a.next();
System.out.println("请输入姓名：");
String name=a.next();
System.out.println("请输入面向对象程序设计成绩：");
int oop=a.nextInt();
System.out.println("请输入网络原理成绩：");
int network=a.nextInt();
System.out.println("请输入姓名数据库成绩：");
int sql=a.nextInt();
Student s2=new Student(college,major,classes,name,oop,network,sql);
System.out.println(s2);
}
}
下面是第一题，采纳此答案发第二题代码
========分割线=========
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class Q1 {
public static void main(String[] args) {
try {
Scanner scanner=new Scanner(System.in);
String data = scanner.nextLine();
File file = new File("java\\code");
if (!file.exists()) {
file.mkdirs();
}
File file1=new File(file,"mydata.txt");
if (!file1.exists()) {
file1.createNewFile();
}
FileWriter fw = new FileWriter(file1.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(data);
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
importjava.awt.*;importjava.awt.event.*;classShopFrameextendsFrameimplementsActionListener{Labellabel1,label2,label3,label4;Buttonbutton1,button2,button3,button4,button5;TextAreatext;Panelpanel1,panel2;staticfloatsum=0.0f;ShopFrame(Strings){super(s);setLayout(newBorderLayout());label1=newLabel("面纸：3元",Label.LEFT);label2=newLabel("钢笔：5元",Label.LEFT);label3=newLabel("书：10元",Label.LEFT);label4=newLabel("袜子：8元",Label.LEFT);button1=newButton("加入购物车");button2=newButton("加入购物车");button3=newButton("加入购物车");button4=newButton("加入购物车");button5=newButton("查看购物车");text=newTextArea("商品有："+"\n",5,10);text.setEditable(false);addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){System.exit(0);}});button1.addActionListener(this);button2.addActionListener(this);button3.addActionListener(this);button4.addActionListener(this);button5.addActionListener(this);panel1=newPanel();panel2=newPanel();panel1.add(label1);panel1.add(button1);panel1.add(label2);panel1.add(button2);panel1.add(label3);panel1.add(button3);panel1.add(label4);panel1.add(button4);panel2.setLayout(newBorderLayout());panel2.add(button5,BorderLayout.NORTH);panel2.add(text,BorderLayout.SOUTH);this.add(panel1,BorderLayout.CENTER);this.add(panel2,BorderLayout.SOUTH);setBounds(100,100,350,250);setVisible(true);validate();}publicvoidactionPerformed(ActionEvente){if(e.getSource()==button1){text.append("一个面纸、");sum=sum+3;}elseif(e.getSource()==button2){text.append("一只钢笔、");sum=sum+5;}elseif(e.getSource()==button3){text.append("一本书、");sum=sum+10;}elseif(e.getSource()==button4){text.append("一双袜子、");sum=sum+8;}elseif(e.getSource()==button5){text.append("\n"+"总价为："+"\n"+sum);}}}publicclassShopping{publicstaticvoidmain(String[]args){newShopFrame("购物车");}}我没用Swing可能显示不出来你的效果。不满意得话我在给你编一个。
Shape.java接口代码
public interface Shape {
public static final double PI = 3.14d;
public double area();
}
Circle.java圆类代码
public class Circle implements Shape {
private double radius;
public Circle(double radius) {
this.radius = radius;
}
@Override
public double area() {
return PI * this.radius * this.radius;
}
public double perimeter() {
return 2 * PI * this.radius;
}
}
Cylinder.java圆柱体类代码
public class Cylinder extends Circle {
private double height;
public Cylinder(double radius, double height) {
super(radius);
this.height = height;
}
public double area() {
return 2 * super.area() + super.perimeter() * this.height;
}
public double volume() {
return super.area() * this.height;
}
}
X5_3_6.java主类代码
public class X5_3_6 {
public static void main(String[] args) {
Circle cir1 = new Circle(5);
System.out.println("圆的面积为：" + cir1.area());
System.out.println("圆的周长为：" + cir1.perimeter());
Cylinder cy1 = new Cylinder(10, 15);
System.out.println("圆柱体的表面积为：" + cy1.area());
System.out.println("圆柱体的体积为：" + cy1.volume());
}
}
上面是我写的代码，下图是执行结果，麻烦看一下，是否可以。