System.out.println(对象)

class Person {
    private String name;
    private int age;
    public String getName() {
        return this.name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public int getAge() {
        return this.age;
    }
    
    public void setAge(int age) {
        this.age = age;
    }
    
    public int getAge() {
        return this.age;
    }
    
    public String toString() {
        return "姓名: " + this.name + ", 年龄: " + this.age;
    }
}

public class InstanceDemo01 {
    public static void main(String args[]) {
        Class<?> c = null;
        try {
            c = Class.forName("Person");
        } catch(ClassNotFoundException e) {
            e.printStackTrace();
        }
        
        Person per = null;
        try {
            per = (Person)c.newInstance();    // 实例化Person对象
        } catch(Exception e) {
            e.printStackTrace();
        }
        
        per.setName("李兴华");
        per.setAge(30);
        System.out.println(per);            // 内容输出: 调用toString()
    }
}