w3

w3/BankAccount.java

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+public class BankAccount {
+    private String accountNumber;
+    private String ownerName;
+    private double balance;
+
+    public BankAccount(String accountNumber, String ownerName) {
+        this.accountNumber = accountNumber;
+        this.ownerName = ownerName;
+        this.balance = 0.0;
+    }
+
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public void deposit(double amount) {
+        if (amount > 0) {
+            balance += amount;
+            System.out.println("存款成功！余额：" + balance);
+        } else {
+            System.out.println("存款金额必须大于0");
+        }
+    }
+
+    public void withdraw(double amount) {
+        if (amount > 0 && amount <= balance) {
+            balance -= amount;
+            System.out.println("取款成功！余额：" + balance);
+        } else {
+            System.out.println("取款失败，余额不足或金额非法");
+        }
+    }
+}

w3/Car.java

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+public class Car {
+    private String brand;
+    private String color;
+    private double price;
+
+    public Car() {
+        this.brand = "未知";
+        this.color = "白色";
+        this.price = 100000;
+    }
+
+    public Car(String brand, String color, double price) {
+        this.brand = brand;
+        this.color = color;
+        if (price > 0) {
+            this.price = price;
+        } else {
+            this.price = 100000;
+        }
+    }
+
+    public String getBrand() {
+        return brand;
+    }
+
+    public void setBrand(String brand) {
+        this.brand = brand;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        if (price > 0) {
+            this.price = price;
+        }
+    }
+}

w3/TeskBank.java

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+public class TestBank {
+    public static void main(String[] args) {
+        BankAccount acc = new BankAccount("62281234", "张三");
+        acc.deposit(1000);
+        acc.withdraw(300);
+        acc.withdraw(1000);
+    }
+}

w3/TestCar.java

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+public class TestCar {
+    public static void main(String[] args) {
+        Car c1 = new Car();
+        Car c2 = new Car("比亚迪", "灰色", 150000);
+    }
+}