Java编程题

[m0_53841467]

编程1 2都要写 麻烦大家了！

[zhuangqingch]

你们这是在考试么。。。 另一帖子是你同学？https://bbs.csdn.net/topics/398773688

[末一森]

问题一： public class Demo01 { public static void main(String[] args) { // TODO Auto-generated method stub Circle c1 = new Circle(100); Circle c2 = new Circle(200); System.out.println("c1圆的面积：" + c1.area() + "周长：" + c1.perimeter()); System.out.println("c2圆的面积：" + c2.area() + "周长：" + c2.perimeter()); } } class Circle{ public int radius; final double PI = 3.14; Circle(int radius){ this.radius = radius; } public double area(){ return radius * radius * PI; } public double perimeter(){ return radius * 2 * PI; } } 问题二： public class X4_3_2 { public static void main(String args[]){ Student s1 = new Student(1, "张三", "男", 18); Student s2 = new Student(2, "李四", "女", 20); s1.showNo(); s1.showName(); s1.showSex(); s1.showAge(); System.out.println("==========="); s2.showNo(); s2.showName(); s2.showSex(); s2.showAge(); System.out.println("==========="); s1.modifyAge(25); System.out.println("修改后的结果是："); s1.showAge(); } } class Student { int s_No; String s_Name; String s_Sex; int s_Age; Student(int s_No, String s_Name, String s_Sex, int s_Age){ this.s_No = s_No; this.s_Name = s_Name; this.s_Sex = s_Sex; this.s_Age = s_Age; } public void showNo(){ System.out.println("学号：" + s_No); } public void showName(){ System.out.println("姓名：" + s_Name); } public void showSex(){ System.out.println("性别：" + s_Sex); } public void showAge(){ System.out.println("年龄：" + s_Age); } public void modifyAge(int s_Age){ this.s_Age = s_Age; } }

[m0_53841467]

引用 2 楼 qq_42672151 的回复：

问题一： public class Demo01 { public static void main(String[] args) { // TODO Auto-generated method stub Circle c1 = new Circle(100); Circle c2 = new Circle(200); System.out.println("c1圆的面积：" + c1.area() + "周长：" + c1.perimeter()); System.out.println("c2圆的面积：" + c2.area() + "周长：" + c2.perimeter()); } } class Circle{ public int radius; final double PI = 3.14; Circle(int radius){ this.radius = radius; } public double area(){ return radius * radius * PI; } public double perimeter(){ return radius * 2 * PI; } } 问题二： public class X4_3_2 { public static void main(String args[]){ Student s1 = new Student(1, "张三", "男", 18); Student s2 = new Student(2, "李四", "女", 20); s1.showNo(); s1.showName(); s1.showSex(); s1.showAge(); System.out.println("==========="); s2.showNo(); s2.showName(); s2.showSex(); s2.showAge(); System.out.println("==========="); s1.modifyAge(25); System.out.println("修改后的结果是："); s1.showAge(); } } class Student { int s_No; String s_Name; String s_Sex; int s_Age; Student(int s_No, String s_Name, String s_Sex, int s_Age){ this.s_No = s_No; this.s_Name = s_Name; this.s_Sex = s_Sex; this.s_Age = s_Age; } public void showNo(){ System.out.println("学号：" + s_No); } public void showName(){ System.out.println("姓名：" + s_Name); } public void showSex(){ System.out.println("性别：" + s_Sex); } public void showAge(){ System.out.println("年龄：" + s_Age); } public void modifyAge(int s_Age){ this.s_Age = s_Age; } }

谢谢！

[m0_53841467]

引用 1 楼 zhuangqingch 的回复：

你们这是在考试么。。。 另一帖子是你同学？https://bbs.csdn.net/topics/398773688

期末作业

[m0_53841467]

引用 2 楼 qq_42672151 的回复：

问题一： public class Demo01 { public static void main(String[] args) { // TODO Auto-generated method stub Circle c1 = new Circle(100); Circle c2 = new Circle(200); System.out.println("c1圆的面积：" + c1.area() + "周长：" + c1.perimeter()); System.out.println("c2圆的面积：" + c2.area() + "周长：" + c2.perimeter()); } } class Circle{ public int radius; final double PI = 3.14; Circle(int radius){ this.radius = radius; } public double area(){ return radius * radius * PI; } public double perimeter(){ return radius * 2 * PI; } } 问题二： public class X4_3_2 { public static void main(String args[]){ Student s1 = new Student(1, "张三", "男", 18); Student s2 = new Student(2, "李四", "女", 20); s1.showNo(); s1.showName(); s1.showSex(); s1.showAge(); System.out.println("==========="); s2.showNo(); s2.showName(); s2.showSex(); s2.showAge(); System.out.println("==========="); s1.modifyAge(25); System.out.println("修改后的结果是："); s1.showAge(); } } class Student { int s_No; String s_Name; String s_Sex; int s_Age; Student(int s_No, String s_Name, String s_Sex, int s_Age){ this.s_No = s_No; this.s_Name = s_Name; this.s_Sex = s_Sex; this.s_Age = s_Age; } public void showNo(){ System.out.println("学号：" + s_No); } public void showName(){ System.out.println("姓名：" + s_Name); } public void showSex(){ System.out.println("性别：" + s_Sex); } public void showAge(){ System.out.println("年龄：" + s_Age); } public void modifyAge(int s_Age){ this.s_Age = s_Age; } }

谢谢！

[KeepSayingNo]

你懂数学逻辑，这个就好写了，无非是用到了java Math类里面的一些计算方法，加油