day09随机点名案例封装实现

朱雀 2022-04-24 02:10 193阅读 0赞

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package com.tedu.demo;
    
    import java.util.ArrayList;
    
    import org.omg.CosNaming.NamingContextExtPackage.AddressHelper;
    
    public class CallName {
    
        /**
         * 
         */
        public static void main(String[] args) {
            ArrayList<Student> array = new ArrayList<Student>();
            addStudents(array);
            printStudent(array);
            randomStudent(array);
    
        } 
        
        //生成随机数，产生随机姓名
        public static void randomStudent(ArrayList<Student> array){
            int index = (int)(Math.random()*array.size());
            Student s = array.get(index);
            System.out.println(s.getName()+" "+s.getAge());
        }
        
        //遍历学生信息
        public static void printStudent(ArrayList<Student> array){
            for(int i=0;i<array.size();i++){
                Student s = array.get(i);
                System.out.println(s.getAge()+" "+s.getName());
            }
        }
        
        //添加学生信息
        public static void addStudents(ArrayList<Student> array){
            Student s1 = new Student();
            s1.setAge(201);
            s1.setName("张三1");
            
            Student s2 = new Student();
            s2.setAge(202);
            s2.setName("张三2");
            
            Student s3 = new Student();
            s3.setAge(203);
            s3.setName("张三3");
            
            Student s4 = new Student();
            s4.setAge(204);
            s4.setName("张三4");
            
            Student s5 = new Student();
            s5.setAge(205);
            s5.setName("张三5");
            
            array.add(s5);
            array.add(s4);
            array.add(s3);
            array.add(s2);
            array.add(s1);
            
        }
    
    }

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package com.tedu.demo;
    
    public class Student {
        /*
         * 定义私有成员变量
         *   姓名，年龄
         */
        private String name;
        private int age;
        
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public int getAge() {
            return age;
        }
        public void setAge(int age) {
            this.age = age;
        }
        
    }

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