1、toString就是獲取物件中的資料

public class Student {
    private String name;
    private  int age;
    private boolean sex;
    private Date birthday;
    private Map<String,Object> location;
    private String[] hobbies;
    private List<String> skills;
    private Pet pet;

    public String getName() {
        
 
return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public boolean isSex() {
        return sex;
    }

    public void setSex(boolean sex) {
        
 
this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Map<String, Object> getLocation() {
        return location;
    }

    public void setLocation(Map<String, Object> location) {
        
 
this.location = location;
    }

    public String[] getHobbies() {
        return hobbies;
    }

    public void setHobbies(String[] hobbies) {
        this.hobbies = hobbies;
    }

    public List<String> getSkills() {
        return skills;
    }

    public void setSkills(List<String> skills) {
        this.skills = skills;
    }

    public Pet getPet() {
        return pet;
    }

    public void setPet(Pet pet) {
        this.pet = pet;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", sex=" + sex +
                ", birthday=" + birthday +
                ", location=" + location +
                ", hobbies=" + Arrays.toString(hobbies) +
                ", skills=" + skills +
                ", pet=" + pet +
                '}';
    }
}

隱式呼叫方法

 Student student; 或者Student student = new Student();
 System.out.println(student);