Java编程题(4)

// 存款

public int deposit(int m) { this.balance += m; return balance; } // 取款

public void qukuan(int m) {

if (this.balance <= 0&&this.balance

System.out.println(\余额不足！\);

} else if(m<=this.balance){ this.balance -= m;

System.out.println(\取款成功！\);

} } //查询

public void query(){

System.out.println(\余额为：\+this.balance);

}

public static void main(String[] args) { Account a= new Account();

System.out.println(\存款，余额为：

\+a.deposit(1000));

System.out.print (\取款：100\\n\); a.qukuan(100);

System.out.print(\查询：\);

a.query();

System.out.println(\); System.out.println(\); System.out.println(\徐延迟\);

} }

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16.定义一个车类，类名为Car，其中含有自己定义的成员变量2~4个，构造方法若干个（至少2个），通过构造方法对它的成员变量进行初始化，在这个类中还定义一个名为toString的成员方法用于输出。

代码如下;

package t16;

public class Car {

private int carID=6666;// 车牌号

private boolean car_insurance=true;// 车险是否已经交了 private String Plate=\玛莎拉蒂\;// 车牌 private String color=\白色\;// 车颜色

public Car() { }

public Car(int carID) { super();

this.carID = carID; }

public Car(int carID, boolean car_insurance, String plate, String color) { super();

this.carID = carID;

this.car_insurance = car_insurance; Plate = plate;

this.color = color; }

public String toString(){

System.out.println(\+carID+\=\+car_insurance+\+Plate+\+color);

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return null; }

public static void main(String[] args) { Car c= new Car(); c.toString();

System.out.println(\); System.out.println(\);

System.out.println(\徐延迟\);

} }

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