1, overloading:
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The same method name, has nothing to do with the return value type (constructor does not return value), but only the parameter list
2, the constructor overloads
Notes [1]
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If we do not give construction method, the system will automatically provide a no-argument constructor method.
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If we give the construction method, the system will no longer provide a default constructor with no arguments.
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Note: This time, if we want to use the no-argument constructor, you must give yourself. Recommend never give their no-argument constructor
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[2] Case
class Demo2_Person {
public static void main(String[] args) {
Person p1 = new Person();
p1.show();
System.out.println("---------------------");
Person p2 = new Person("张三",23);
p2.show();
System.out.println("---------------------");
Person p3 = new Person("李四",24);
p3.show();
}
}
class Person {
private String name; //姓名
private int age; //年龄
public Person() { //空参构造
System.out.println("空参的构造");
}
public Person(String name,int age) {
this.name = name;
this.age = age;
System.out.println("有参的构造");
}
public void show() {
System.out.println(name + "..." + age);
}
}