//////// One package Chp11; import java.util.ArrayList; import java.util.List; public class TestListOne { public static void main(String[] args) { List<String> list = new ArrayList<String>(); list.add("Hello"); list.add("World"); list.add(1,"Learn"); list.add(1,"Java"); PrintList(list); } public static void PrintList(List<String> list) { System.out.println(list); } } ///////////////////////////////////////////////////////////////// // Two package Chp11; import java.util.ArrayList; import java.util.List; public class TestJavaTwo { public static void main(String[] args) { List<String> list = new ArrayList<String>(); list.add("Hello"); list.add("World"); // list.add("World"); list.add("Hello"); list.add("Learn"); list.remove("Hello"); list.remove(0); for (int i = 0; i < list.size(); i++) { System.out.println(list.get(i)); } } } //////////////////////////////// /// Three /* 3. (List)已知有一个Worker 类如下: public class Worker { private int age; private String name; private double salary; public Worker (){} public Worker (String name, int age, double salary){ this.name = name; this.age = age; this.salary = salary; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getSalary(){ return salary; } public void setSalary(double salary){ this.salary = salary; } public void work(){ System.out.println(name + “ work”); } } 完成下面的要求 1) 创建一个List,在List 中增加三个工人,基本信息如下: 姓名 年龄 工资 zhang3 18 3000 li4 25 3500 wang5 22 3200 1) 插入一个工人,信息为:姓名:zhao6,年龄:24,工资3300 2) 删除wang5 的信息 3) 遍历,对List 中所有的工人调用work 方法。 */ // 答案: public class TestListThree { public static void sop(List<Worker> workers) { System.out.println("Name Age Sallary"); /* 第一种: for (int i = 0; i < workers.size(); i++) { System.out.print(workers.get(i).getName()+" "); System.out.print(workers.get(i).getAge()+" "); System.out.println(workers.get(i).getSalary()); } */ // 第二种方法 for (Worker worker : workers) { System.out.print(worker.getName()+" "); System.out.print(worker.getAge()+" "); System.out.println(worker.getSalary()); } } public static void main(String[] args) { List<Worker> workers = new ArrayList<Worker>(); workers.add(new Worker("zhang3", 18, 3000)); workers.add(new Worker("li4", 25, 3500)); workers.add(new Worker("wang5", 22, 3200)); sop(workers); System.out.println("====================="); workers.add(new Worker("zhao6",22,3300)); sop(workers); System.out.println("====================="); workers.remove(2); sop(workers); } } /* 题目: (Map)已知某学校的教学课程内容安排如下: 老师 课程 Tom CoreJava John Oracle Susan Oracle Jerry JDBC Jim Unix Kevin JSP Lucy JSP 完成下列要求: 1) 使用一个Map,以老师的名字作为键,以老师教授的课程名作为值,表示上述课程安排。 2) 增加了一位新老师Allen 教JDBC 3) Lucy 改为教CoreJava 4) 遍历Map,输出所有的老师及老师教授的课程 5) *利用Map,输出所有教JSP 的老师。 */ // 答案如下: package Chp11; import java.util.HashMap; import java.util.Map; import java.util.Set; public class TestMapFour { /** * @param args */ public static void main(String[] args) { Map<String, String> map = new HashMap<String, String>(); map.put("Tom", "CoreJava"); map.put("John", "Oracle"); map.put("SuSan", "Oracle"); map.put("Jerry", "Jdbc"); map.put("Jim", "Unix"); map.put("Kevin", "Jsp"); map.put("Lucy", "Jsp"); // 1.增加 map.put("Allen", "JDBC"); // 2.修改 map.put("Lucy", "CoreJava "); // 3.遍历 Set<String> set = map.keySet(); for (String s : set) { String value = map.get(s); // 通过键取值 System.out.println(s+" 教的课程为 "+value); // 4.教JSP的老师 if ("JSP".equals(value)) { System.out.println(s+" 教的课程为 "+value); } } } }