1 package com.baidu;
2 public class TestSimpleCircle {
3 public static void main(String[] args) {
4 SimpleCircle circle1 = new SimpleCircle();
5 System.out.println("The area of the cricle of radius " + circle1.radius + " is " + circle1.getArea());
6
7 SimpleCircle circle2 = new SimpleCircle(25);
8 System.out.println("The area of the circle of radius " + circle2.radius + " is " + circle2.getArea());
9
10 SimpleCircle circle3 = new SimpleCircle(125);
11 System.out.println("The area of the circle of radius " + circle3.radius + " is " + circle3.getArea());
12
13 System.out.println("The area of the circle of radius " + circle3.radius + " is " + circle3.getArea());
14
15 circle2.radius = 100;
16 System.out.println("The area of the circle of radius " + circle2.radius + " is " + circle2.getArea());
17 circle2.setRadius(10);
18 System.out.println("The area of the circle of radius " + circle2.radius + " is " + circle2.getArea());
19
20 SimpleCircle circle4 = new SimpleCircle(10);
21 System.out.println("The area of the circle of radius " + circle4.radius + " is " + circle4.getPerimeter());
22
23 circle2.radius = 10;
24 System.out.println("The area of the circle of radius " + circle2.radius + " is " + circle2.getPerimeter());
25 System.out.println(circle2.getPerimeter());
26
27 double area=circle1.getArea();
28 System.out.println(area);
29
30
31
32 }
33 }
34 class SimpleCircle {
35 double radius;
36 SimpleCircle(){
37 radius = 1;
38 }
39 SimpleCircle(double newRadius){
40 radius = newRadius;
41 }
42 double getArea() {
43 return radius*radius*Math.PI;
44 }
45 double getPerimeter() {
46 return 2*radius*Math.PI;
47 }
48 void setRadius(double newRadius) {
49 radius = newRadius;
50 }
51 }
1 package com.baidu;
2
3 public class Tv {
4 public static void main(String[] args) {
5 // TV tv1=new TV();
6 // tv1.turnOff();
7 // tv1.setChannel(30);
8 // tv1.setVolumeLevel(3);
9
10 Tv tv2=new Tv();
11 tv2.turnOn();
12 System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
13 tv2.channelUp();
14 System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
15 tv2.channelUp();
16 System.out.println("TV2's channel is "+tv2.channel
+" and volume is "+tv2.volumeLevel);
17 tv2.channelUp();
18 System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
19 tv2.volumeUp();
20 System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
21 tv2.volumeUp();
22 System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
23 tv2.volumeUp();
24 System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
25
26
27 }
28
29 public int channel=1;
30 public int volumeLevel=1;
31 public boolean on=false;
32
33 public Tv() {
34
35 }
36 public void turnOn() {
37 on =true;
38 System.out.println("电视机已经打开了。");
39 }
40 public void turnOff() {
41 on=false;
42 System.out.println("电视机已经关闭了。");
43 }
44 public int getChannel() {
45 return channel;
46 }
47 public void setChannel(int channel) {
48 if(on) {
49 System.out.println("电视机已开,可以开始调台了。");
50 if(channel>=1&&channel<=120) {
51 this.channel = channel;
52 System.out.println("频道已经调到 "+channel+" 台");
53 }else {
54 System.out.println("你要调的频道不存在。");
55 }
56 }else {
57 System.out.println("电视机关着的时候是不能调台的");
58 }
59 }
60 public int getVolumeLevel() {
61 return volumeLevel;
62 }
63 public void setVolumeLevel(int volumeLevel) {
64 if(on) {
65 System.out.println("电视机已开,声音大小可调了");
66 if(volumeLevel>=1&&volumeLevel<=7) {
67 this.volumeLevel = volumeLevel;
68 System.out.println("声音的大小设置成了 "+volumeLevel+" 大小");
69 }
70 }else {
71 System.out.println("电视机关着的时候是不能调声音的");
72 }
73
74 }
75 public void channelUp() {
76 if(on&&channel<120) {
77 channel++;
78 }
79 }
80 public void channelDown() {
81 if(on&&channel>1) {
82 channel--;
83 }
84 }
85 public void volumeUp() {
86 if(on&&volumeLevel<7) {
87 volumeLevel++;
88 }
89 }
90 public void volumeDown() {
91 if(on&&volumeLevel>1) {
92 volumeLevel--;
93 }
94 }
95 }
96
1 package dengniu;
2 public class Dp {
3 public static void main(String args[]) {
4 Person per1 = new Person("张三",30);
5 Person per2 = new Person("张三",30);
6 if(per1.getName().equals(per2.getName())&&per1.getAge()==per2.getAge()) {
7 System.out.println("是同一个人!");
8 }
9 }
10 }
11
12 class Person {
13 private String name;
14 private int age;
15 public Person(String name,int age) {
16 this.name = name;
17 this.age = age;
18 }
19
20
21
22 public boolean compare(Person per) {
23 if(this.name.equals(per.name)&&this.age==per.age) {
24 return true;
25 }else {
26 return false;
27 }
28 }
29
30 // public void fun(Person temp) {
31 // temp.name="李武";
32 // temp.age=45;
33 // }
34 //
35 public String getName() {
36 return this.name;
37 }
38
39 public int getAge() {
40 return this.age;
41 }
42 }
43
44
45
46
47
48
49
50
1 package dengniu;
2
3 public class DtaticDemo {
4
5 public static void main(String[] args) {
6 new DtaticDemo().fun();
7 }
8 public static void fun() {
9 System.out.println("hellow every day!");
10
11 }
12
13 }
This moment will nap, you will have a dream; but this moment study, you will interpret a dream.