package cn.netkiller;

import java.lang.reflect.Field;


public class Test {
    static class MyClass {
        public String var1 = "Hello";
        public int var2 = 123;
        public double var3;
        public String var4;
    }

    public static void main(String[] args) throws IllegalAccessException, NoSuchFieldException {
        MyClass obj = new MyClass();

//        obj.var4 = "World";

        Class<? extends MyClass> clazz = obj.getClass();
        Field field1 = clazz.getDeclaredField("var4");
        field1.setAccessible(true); // 设置可访问性
        field1.set(obj, "Neo"); // 设置值


        Field[] fields = obj.getClass().getDeclaredFields();
        for (Field field : fields) {
            field.setAccessible(true); // 设置为可访问
            if (field.get(obj) != null) {
                System.out.println(field.getName() + " = " + field.get(obj));
            }
        }
    }
}
		
		
		

		
package cn.netkiller;

import lombok.Data;

import java.lang.reflect.Field;


public class Test {
    @Data
    static class MyClass {
        public String var1;
        public Integer var2;
        public Double var3;
        public String var4;
    }

    public static Object setValue(Object obj, Object target) throws IllegalAccessException, NoSuchFieldException {
        Field[] fields = obj.getClass().getDeclaredFields();
        Class<?> clazz = target.getClass();
        for (Field field : fields) {
            field.setAccessible(true); // 设置为可访问
            System.out.println(field.getName() + " = " + field.get(obj));
            if (field.get(obj) != null) {

                Field field1 = clazz.getDeclaredField(field.getName());
                field1.setAccessible(true); // 设置可访问性
                field1.set(target, field.get(obj)); // 设置值
            }
        }
        System.out.println(target);
        return target;
    }

    public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException {
        MyClass obj = new MyClass();
        obj.var1 = "Hello";
        obj.var4 = "World";
        MyClass target = new MyClass();
        setValue(obj, target);
    }
}