关于JAVA反射的一个问题

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;
    }
}

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]

[code="java"]
Head head = new Head();
head.setEye("eye000");
head.setNose("nose000");
Body body = new Body();
body.setArm("arm000");
body.setLeg("leg000");
Human human = new Human();
human.setHead(head);
human.setBody(body);

    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);
    System.out.println(eyeField.getName() + " : " + eyeField.get(human.getHead()));
    System.out.println(noseField.getName() + " : " + noseField.get(human.getHead()));

显示结果为：
eye : eye000
nose : nose000
[/code]

楼上两个回复已经可以解决问题了。楼主如果要实现以后正确运用，建议还是从反射的这些API入手，详细了解下，比如
[code="java"]
getDeclaredField()
getDeclaredMethods()
getFields()
[/code]
可以获取到相应的对象的Class的对象之后，遍历一下这些方法的返回值，大概会更清楚些。