1 public class Teacher1{
 2     private String name;
 3     private int age;
 4     private char gender;
 5     private String majorField;
 6     public String getName(){
 7         return name;
 8     }
 9     public void setName(String name){
10         this.name=name;
11     }
12     public int getAge(){
13         return age;
14     }
15     public void setAge(int age){
16         if(age<0 || age>100){
17         this.age=30;
18         System.out.println("年龄应该在0到100之间，默认为30");
19     }else{
20         this.age=age;
21     }
22 }
23 public char getGender(){
24     return gender;
25 }
26 public void setGender(char gender){
27     this.gender=gender;
28 }
29 public String getMajorField(){
30     return majorField;
31 }
32 public void setMajorField(String majorField){
33     this.majorField=majorField;
34 }
35 public Teacher1(){
36     name="李丽";
37     age=25;
38     gender='女';
39     majorField=".NET";
40 }
41 public Teacher1(int a,char g){
42     age=a;
43     gender=g;
44 }
45 public void print(){
46     System.out.println("我是"+name+",我的年纪是"+age+"岁，我的性别是"+gender+"，我的专业研究ß"+majorField);
47 }
48 }
49 public class TestPeople{
50     public static void main(String args[]){
51     People p1=new People("Lili",20,'woman',55,165);
52     p1.speak();
53     String temp=p1.info();
54     System.out.println(temp);
55         }
56 }
57
58 public class Test9{
59     public static void main(String[] args) {
60         Teacher1 t1=new Teacher1();
61
62         //为属性赋值用setXXX()方法
63         t1.setName("戚薇");
64         t1.setAge(200);
65         t1.setGender('女');
66         t1.setMajorField(".Net");
67
68         //取属性的值用getXXX()方法
69         System.out.println("我的名字叫"+t1.getName());
70         t1.print();
71     }
72 }

class A{int a;int b;
}public class TestParam{public void exchange(int x,int y){System.out.println("交换前：x="+x+",y="+y);int temp=x;x=y;y=temp;System.out.println("交换后：x="+x+",y"+y);}public void exchange(A a){System.out.println("交换前：x="+x+",y="+y);int temp=a.a;          //a.a是什么意思？??任意一个变量，引用数据类型的一种写法a.a=a.b;a.b=temp;System.out.println("交换后：x="+x+",y="+y);}public static void main(String[] args){A a=new A();a.a=1;a.b=2;TestParam tp=new TestParam();int x=5;int y=10;System.out.println("在main()方法中，交换前：x="+x+",y="+y);tp.exchange(x,y);System.out.println("在main()方法中，交换后：x="+x+",y="+y);System.out.println("\n\n在main()方法中，交换前a.a="+a.a+",a.b="+a.b);tp.exchange(a);System.out.println("在main()方法中，交换前：a.a="+a.a+",a.b="+a.b);}
}

public class VarArgs {public static void main(String[] args) {System.out.println(sum(1, 2));System.out.println(sum(1, 2, 3));}/*** 变长参数求和* <a href="http://home.cnblogs.com/u/309701/" target="_blank">@param</a> args* @return*/public static int sum(int... args) {int n = 0;for (int arg : args) {n += arg;}return n;}}