java父子类

将父类属性值传递给子类

package com.syl.test;

public class A {
	private String a;
    private String b;

    public String getA() {
        return a;
    }

    public void setA(String a) {
        this.a = a;
    }

    public String getB() {
        return b;
    }

    public void setB(String b) {
        this.b = b;
    }

	@Override
	public String toString() {
		return "A [a=" + a + ", b=" + b + "]";
	}
    
}

package com.syl.test;

public class B extends A{
	
	   private String c;
	    private String d;

	    public String getC() {
	        return c;
	    }

	    public void setC(String c) {
	        this.c = c;
	    }

	    public String getD() {
	        return d;
	    }

	    public void setD(String d) {
	        this.d = d;
	    }

		@Override
		public String toString() {
			return "A [a=" + getA() + ", b=" + getB() + "]B [c=" + c + ", d=" + d + "]";
		}
	    
}

利用反射调用父类的get方法

public class CopyFatherToChild {
	public static void main(String[] args) throws Exception {
        A a=new A();
        B b=new B();
        a.setA("a");
        a.setB("b");
        b.setC("c");
        b.setD("d");
        fatherToChild(a,b);
        System.out.println(b);
    }


    public static <T>void fatherToChild(T father,T child) throws Exception {
        if (child.getClass().getSuperclass()!=father.getClass()){
            throw new Exception("child 不是 father 的子类");
        }
        Class<?> fatherClass = father.getClass();
        Field[] declaredFields = fatherClass.getDeclaredFields();
        for (int i = 0; i < declaredFields.length; i++) {
            Field field=declaredFields[i];
            Method method=fatherClass.getDeclaredMethod("get"+upperHeadChar(field.getName()));
            Object obj = method.invoke(father);
            field.setAccessible(true);
            field.set(child,obj);
        }

    }
    /**
     * 首字母大写，in:deleteDate，out:DeleteDate
     */
    public static String upperHeadChar(String in) {
        String head = in.substring(0, 1);
        String out = head.toUpperCase() + in.substring(1, in.length());
        return out;
    }
}