JAVA进阶7

 1 import java.util.HashMap;
 2 import java.util.Map;
 3 
 4 public class demo01 {
 5     public static void main(String[] args) {
 6         Map<String, String> map = new HashMap<String, String>();
 7         map.put("1", "apple");
 8         map.put("2", "pear");
 9         map.put("3", "orange");
10         for (int i = 1; i <= 3; i++) {
11             System.out.println("第"+i+"元素是："+map.get(""+i+""));
12         }
13     }
14 }

 1 import java.util.ArrayList;
 2 import java.util.List;
 3 
 4 //创建类
 5 public class demo01 {
 6     //主方法
 7     public static void main(String[] args) {
 8         // 创建集合对象
 9         List list = new ArrayList();
10         //  获得0-2之间的随机数
11         int i = (int) (Math.random()) * (list.size() - 1);
12         list.add("a");   //向集合中添加元素
13         list.add("b");
14         list.add("C");
15         list.add("D");
16         System.out.println("随机获取数组中的元素：" + list.get(i));
17         list.remove(2);  //将指定索引位置的元素从集合中移除
18         System.out.println("将索引为2的元素从数组移除后，数组的元素是：");
19         for (int j = 0; j < list.size(); j++) {
20             System.out.print(list.get(j) + " ,");
21         }
22     }
23 }

 1 package cn.intcast.day06.demo01;
 2 
 3 public class phonetwo {
 4     public static void main(String[] args) {
 5         phone one = new phone();
 6         one.brand = "三星";
 7         one.price = 5555.0;
 8         one.color = "红色";
 9 method(one);    //传递进去的参数其实就是地址值
10     }
11     public static void method(phone param){
12         System.out.println(param.brand);
13         System.out.println(param.price);
14         System.out.println(param.color);
15     }
16 }

 1 package cn.intcast.day06.demo01;
 2 
 3 public class phonetwo {
 4     public static void main(String[] args) {
 5         phone two = getphone();
 6         System.out.println(two.brand);
 7         System.out.println(two.price);
 8         System.out.println(two.color);
 9     }
10 
11     public static phone getphone() {
12         phone one = new phone();
13         one.brand = "三星";
14         one.price = 5555.0;
15         one.color = "红色";
16         return one;
17     }
18 }

 1 package cn.intcast.day06.demo01;
 2 /*
 3 * 对于boolean值的private
 4 * 要用setXxx,和isXxx
 5 * */
 6 public class Student {
 7     private String name;
 8     private int age;
 9     private boolean male;
10 
11     public void setMale(boolean b) {
12         male = b;
13     }
14 
15     public boolean isMale() {
16         return male;
17     }
18 
19     public void setName(String str) {
20         name = str;
21     }
22 
23     public String getName() {
24         return name;
25     }
26 
27     public void setAge(int num) {
28         if (num > 0 && num < 99) {
29             age = num;
30         } else {
31             System.out.println("数据不合理");
32         }
33     }
34 
35     public int getAge() {
36         return age;
37     }
38 
39 }

 1 package cn.intcast.day06.demo01;
 2 
 3 public class dmeo07student {
 4     public static void main(String[] args) {
 5         Student stu = new Student();
 6         stu.setName("赵政");
 7         stu.setAge(22);
 8         stu.setMale(true);
 9 
10         System.out.println("姓名:"+stu.getName());
11         System.out.println("年龄:"+stu.getAge());
12         System.out.println("是否是男生:"+stu.isMale());
13     }
14 
15 }

 1 package cn.intcast.day06.demo01;
 2 
 3 public class Student {
 4     private String name;    //姓名
 5     private int age;        //年龄
 6     private boolean male;   //性别
 7 
 8     public Student() {
 9     }
10 
11     public Student(String name, int age) {
12         this.name = name;
13         this.age = age;
14     }
15 
16     public String getName() {
17         return name;
18     }
19 
20     public void setName(String name) {
21         this.name = name;
22     }
23 
24     public int getAge() {
25         return age;
26     }
27 
28     public void setAge(int age) {
29         this.age = age;
30     }
31 
32     public boolean isMale() {
33         return male;
34     }
35 
36     public void setMale(boolean male) {
37         this.male = male;
38     }
39 }

 1 package cn.intcast.day06.demo01;
 2 
 3 public class dmeo07student {
 4     public static void main(String[] args) {
 5         Student stu1 = new Student();
 6         stu1.setName("白起");
 7         stu1.setAge(40);
 8         System.out.println("姓名："+stu1.getName()+",年龄："+stu1.getAge());
 9         Student stu2 = new Student("蒙恬",45);
10         System.out.println("姓名："+stu2.getName()+",年龄："+stu2.getAge());
11         stu2.setName("英籍");
12         System.out.println("姓名："+stu2.getName()+",年龄："+stu2.getAge());
13     }
14 
15 }