迭代器遍历

src/chapter6/Example04.java

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+package chapter6;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+public class Example04 {
+    public static void main(String[] args) {
+        ArrayList<String> list = new ArrayList<>();
+        list.add("张三");
+        list.add("李四");
+        list.add("王五");
+        list.add("张三");
+
+        Iterator<String> iterator = list.iterator();
+        while (iterator.hasNext()) {
+            String name = iterator.next();
+            if (name.equals("张三")) {
+                iterator.remove();
+            }
+        }
+
+        System.out.println(list);
+    }
+}

src/chapter6/Example05.java

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+package chapter6;
+
+import java.util.ArrayList;
+
+public class Example05 {
+    public static void main(String[] args) {
+        ArrayList<String> list = new ArrayList<>();
+        list.add("A");
+        list.add("B");
+        list.add("C");
+        list.add("D");
+
+        for(String s : list){
+            System.out.println(s);
+        }
+    }
+}

src/chapter6/Example3.java

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+package chapter6;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+public class Example3 {
+    public static void main(String[] args) {
+        ArrayList<String> list = new ArrayList();
+        list.add("A");
+        list.add("B");
+        list.add("C");
+        list.add("D");
+
+        Iterator<String> iterator = list.iterator();
+        // Iterator> iterator = list.iterator();
+        while (iterator.hasNext()) {
+            String item =  iterator.next();
+            // String item =  (String) iterator.next();
+            System.out.println(item);
+        }
+    }
+}

src/chapter6/demo61/Goods.java

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+package chapter6.demo61;
+
+/**
+ * 商品类
+ */
+public class Goods {
+    private String name;
+    private double price;
+    private int num;
+
+    public Goods(String name, double price, int num) {
+        this.name = name;
+        this.price = price;
+        this.num = num;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+    public int getNum() {
+        return num;
+    }
+
+    public void setNum(int num) {
+        this.num = num;
+    }
+
+    public String toString() {
+        return name + "\t" + price + "\t" + num;
+    }
+}

src/chapter6/demo61/Manager.java

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+package chapter6.demo61;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Scanner;
+
+public class Manager {
+    static ArrayList goodsList = new ArrayList<>();
+    // static ArrayList<Goods> goodsList = new ArrayList<>();
+    public static void main(String[] args) {
+        Goods meizu = new Goods("魅族22", 3999, 11);
+        goodsList.add(meizu);
+
+        goodsList.add(new Goods("小米15", 6899, 10));
+        goodsList.add(new Goods("iPhone15", 5999, 2));
+
+        while (true) {
+            System.out.println("欢迎使用库房管理系统");
+            System.out.println("1. 商品入库");
+            System.out.println("2. 商品显示");
+            System.out.println("3. 商品出库");
+            System.out.print("请选择要进行的操作：");
+
+            Scanner sc = new Scanner(System.in);
+            int select = sc.nextInt();
+            switch (select) {
+                case 1:
+                    addGoods();
+                    System.out.println("商品入库成功，入库后仓库商品如下：");
+                    showWareHouse();
+                    break;
+                case 2:
+                    showWareHouse();
+                    break;
+                case 3:
+                    System.out.print("请输入要出库的商品编号：");
+                    int id = sc.nextInt();
+                    removeGoods(id);
+                    System.out.println("商品出库成功，出库后仓库商品如下：");
+                    showWareHouse();
+                    break;
+            }
+        }
+    }
+
+    // 商品入库
+    static void addGoods() {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("商品名称：");
+        String name = sc.next();
+
+        System.out.print("商品价格：");
+        double price = sc.nextDouble();
+
+        System.out.print("商品数量：");
+        int num = sc.nextInt();
+
+        // Goods g = new Goods(name, price, num);
+        // goodsList.add(g);
+
+        goodsList.add(new Goods(name, price, num));
+    }
+
+    // 商品出库（从goodList中删除指定位置的元素）
+    static void removeGoods(int index) {
+        goodsList.remove(index);
+    }
+
+    // 使用迭代器遍历商品
+    static void showWareHouse() {
+        System.out.println("==========================");
+        Iterator iterator = goodsList.iterator();
+        while (iterator.hasNext()) {
+            Goods goods = (Goods) iterator.next(); // 类型转换（Object->Goods）
+            System.out.println(goods);
+        }
+        System.out.println("==========================");
+    }
+}