关于JAVA反射的一个问题

Question

有三个类，Human，Head，Body，请问如何用反射获取Human中的Head中的属性(eye，nose)?

如下：

public class Human {
    private Head head;
    private Body body;
    public Head getHead() {
        return head;
    }
    public void setHead(Head head) {
        this.head = head;
    }
    public Body getBody() {
        return body;
    }
    public void setBody(Body body) {
        this.body = body;
    }
}

public class Head {
    private String eye;
    private String nose;
    public String getEye() {
        return eye;
    }
    public void setEye(String eye) {
        this.eye = eye;
    }
    public String getNose() {
        return nose;
    }
    public void setNose(String nose) {
        this.nose = nose;
    }
}

public class Body {
    private String arm;
    private String leg;
    public String getArm() {
        return arm;
    }
    public void setArm(String arm) {
        this.arm = arm;
    }
    public String getLeg() {
        return leg;
    }
    public void setLeg(String leg) {
        this.leg = leg;
    }
}

 

Answer 1

楼上不是完全的反射，因为楼上直接调用了human.getHead()方法取到了Head对象，题主的问题完全使用反射。改造一下如下：

[code="java"]Class<?> humanClazz = human.getClass();
Field headField = humanClazz.getDeclaredField("head");
Class<?> headClazz = headField.getType();
Field eyeField = headClazz.getDeclaredField("eye");
Field noseField = headClazz.getDeclaredField("nose");
eyeField.setAccessible(true);
noseField.setAccessible(true);
headField.setAccessible(true);
Object head = headField.get(human);
System.out.println(eyeField.getName() + " : " + eyeField.get(head));
System.out.println(noseField.getName() + " : " + noseField.get(head));[/code]