Java实验二：面向对象

1．定义一个计算机类，要求该类中至少包含3个私有的属性（为每个属性定义设置和获取方法）,该类中至少包含两个构造方法（一个无参，一个有参），以及包含2-4个方法来描述计算机对象的行为（其中一个方法要能打印输出计算机对象的所有属性值）。

Computer.java

/*** Created with IntelliJ IDEA.* Description: 定义计算机类* User: Li_yizYa* Date: 2022—05—21* Time: 23:13*/
public class Computer {private String computerName;private double computerPrice;private String computerType;//无参的构造方法public Computer(){}//有参的构造方法public Computer(String computerName, double computerPrice, String computerType) {this.computerName = computerName;this.computerPrice = computerPrice;this.computerType = computerType;}//方法1: 玩游戏public void play() {System.out.println("使用" + this.computerName + "电脑玩游戏");}//方法2: 打印电脑的属性public void printComputer() {System.out.println("============打印电脑属性============");System.out.println("电脑品牌为: " + this.computerName);System.out.println("电脑类型为: " + this.computerType);System.out.println("电脑价格为: " + this.computerPrice);System.out.println("=================================");}//方法3: 追剧public void watch() {System.out.println("使用" + this.computerName + "电脑追剧");}
}

测试类：Test.java

class Test {public static void main(String[] args) {Computer computer = new Computer("苹果",6555.2,"台式");computer.printComputer();computer.play();computer.watch();}
}

运行结果 

2．定义一个类，该类中包含以下几个方法（静态）：

实现两个字符串数组的逆序排序，输出结果为字符串数组；

求两个整形数组的交集；

求两个浮点型数组的并集；

MyClass.java(功能类)

package experiment2;/*** Created with IntelliJ IDEA.* Description:* User: Li_yizYa* Date: 2022—05—21* Time: 23:36*/
public class Myclass {//实现两个字符串数组的逆序排序，输出结果为字符串数组public static String[] reverse(String[] str1, String[] str2) {String[] ret = new String[str1.length+str2.length];int index = 0;for(int i = str1.length-1; i >= 0; i--) {ret[index++] = str1[i];}for (int i = str2.length-1; i >= 0 ; i--) {ret[index++] = str2[i];}return ret;}//求两个整形数组的交集public static void intersect(int[] arr1, int[] arr2) {int flag = 0;for(int i = 0; i < arr1.length; i++) {for (int j = 0; j < arr2.length; j++) {if(arr1[i] == arr2[j]) {flag = 1;System.out.print(arr1[i] + " ");}}}if(flag == 0) {System.out.println("两个整形数组的交集为空");}}//求两个浮点型数组的并集public static void union(double[] arr1, double[] arr2) {double[] ret = new double[arr1.length+arr2.length];for (int i = 0; i < ret.length; i++) {ret[i] = Integer.MAX_VALUE;}int index = 0;for (int i = 0; i < arr1.length; i++) {ret[index++] = arr1[i];}for (int i = 0; i < arr2.length; i++) {int flag = 0;for (int j = 0; ret[j] < Integer.MAX_VALUE; j++) {if(arr2[i] == ret[j]) {flag = 1;}}if(flag == 0) {ret[index++] = arr2[i];}}for (int i = 0; ret[i] < Integer.MAX_VALUE; i++) {System.out.print(ret[i] + " ");}}
}

Test3.java(测试类) 

public class Test3 {public static void main(String[] args) {String[] str1 = {"abc","bcd","abd"};String[] str2 = {"cda","aaa","bbb"};String[] ret = Myclass.reverse(str1,str2);System.out.println("字符串1逆序后的结果为: ");for (int i = 0; i < str1.length; i++) {System.out.print(ret[i] + " ");}System.out.println();System.out.println("字符串2逆序后的结果为: ");for (int i = 0; i < str2.length; i++) {System.out.print(ret[i] + " ");}System.out.println();System.out.println("=======================");int[] arr1 = {1,3,5,7,9};int[] arr2 = {2,4,9,8};System.out.println("两个整型数组的交集为: ");Myclass.intersect(arr1,arr2);System.out.println();System.out.println("=======================");double[] arr3 = {3.2,4.1,5.8,6.9};double[] arr4 = {3.3,6.9,9.2,7.1};System.out.println("两个浮点型数组的并集为: ");Myclass.union(arr3,arr4);}
}

运行结果 

3．定义一个表示学生信息的类Student，要求如下：

  （1）类Student的成员变量：

sNO　表示学号；sName表示姓名；sSex表示性别；sAge表示年龄；sJava：表示Java课程成绩。

  （2）类Student带参数的构造方法：

在构造方法中通过形参完成对成员变量的赋值操作。

 （3）类Student的方法成员：

getNo（）：获得学号；

getName（）：获得姓名；

getSex（）：获得性别；

getAge（）获得年龄；

getJava（）：获得Java 课程成绩

setNo（）：设置学号；

setName（）：设置姓名；

setSex（）：设置性别；

setAge（）；设置年龄

setJava（）：设置Java 课程成绩

具体代码

/*** Created with IntelliJ IDEA.* Description: 学生信息类* User: Li_yizYa* Date: 2022—05—22* Time: 0:32*/
public class Student {private int sNo;private String sName;private String sSex;private int sAge;private int sJava;public Student(int sNo, String sName, String sSex, int sAge, int sJava) {this.sNo = sNo;this.sName = sName;this.sSex = sSex;this.sAge = sAge;this.sJava = sJava;}public int getsNo() {return sNo;}public void setsNo(int sNo) {this.sNo = sNo;}public String getsName() {return sName;}public void setsName(String sName) {this.sName = sName;}public String getsSex() {return sSex;}public void setsSex(String sSex) {this.sSex = sSex;}public int getsAge() {return sAge;}public void setsAge(int sAge) {this.sAge = sAge;}public int getsJava() {return sJava;}public void setsJava(int sJava) {this.sJava = sJava;}@Overridepublic String toString() {return "学号: " + sNo +", 姓名: " + sName + ' ' +", 性别: " + sSex + ' ' +", 年龄: " + sAge +", Java成绩: " + sJava;}
}

根据类Student的定义，创建五个该类的对象，输出每个学生的信息，计算并输出这五个学生Java语言成绩的平均值，以及计算并输出他们Java语言成绩的最大值和最小值。

public class Test2 {public static void main(String[] args) {Student[] students = new Student[5];students[0] = new Student(1,"张三","男",18,92);students[1] = new Student(2,"李四","男",19,81);students[2] = new Student(3,"王五","男",18,76);students[3] = new Student(4,"张三金","男",20,99);students[4] = new Student(5,"赵东","男",18,87);int count = 0;int maxScore = 0;int minScore = 100;System.out.println("=====================学生信息表========================");for (Student student : students) {//计算五名学生总分count += student.getsJava();//获取最高成绩if(student.getsJava() > maxScore) {maxScore = student.getsJava();}//获取最低成绩if(student.getsJava() < minScore) {minScore = student.getsJava();}System.out.println(student.toString());}System.out.println("=====================================================");System.out.println();System.out.println("Java语言成绩最高分为: " + maxScore);System.out.println("Java语言成绩最低分为: " + minScore);System.out.println("Java语言成绩平均分为: " + (double)count/ students.length);}
}

运行结果 

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