同一类一个对象属性赋值到另一个对象的属性，前者存在的替换，不存在的不做改动

来源：互联网发布：简书app源码编辑：程序博客网时间：2024/05/18 03:06

对于类

public class Car{private String brand;private String color;private Integer maxSpeed;public Car(){    super();}public Car(String brand, String color, int maxSpeed){    super();    this.brand = brand;    this.color = color;    this.maxSpeed = maxSpeed;}public void introduce(){    System.out.println( "Car [brand=" + brand + ", color=" + color + ", maxSpeed=" + maxSpeed + "]");}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 int getMaxSpeed(){    return maxSpeed;}public void setMaxSpeed(int maxSpeed){    this.maxSpeed = maxSpeed;}@Overridepublic String toString(){    return "Car [brand=" + brand + ", color=" + color + ", maxSpeed=" + maxSpeed + "]";}}

用反射实现如：

public class CarToCar{public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException{    Car car = new Car("玛莎拉蒂", "红", 200);    Car oldCar = new Car("玛莎拉蒂","黑",300);    Field[] fields = Car.class.getDeclaredFields();    for(Field field:fields){        field.setAccessible(true);        //System.out.println(field.getName());        //System.out.println(field.get(car));        if(null!=field.get(car)){            field.set(oldCar, field.get(car));        }    }    System.out.println(oldCar);}

}
oldCar被替换。

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