1. 构造方法

https://zhuanlan.zhihu.com/p/79087128

Java Bean类

public class Person {
    private String name;
    private int age;
    private Object feature;

    public Person() { }

    public Person(String name, int age, Object feature) {
        this.name = name;
        this.age = age;
        this.feature = feature;
    }

    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 Object getFeature() {
        return feature;
    }

    public void setFeature(Object feature) {
        this.feature = feature;
    }
}

转换为Kotlin

package top.iqqcode.loop

class Person {
    var name: String? = null
    var age = 0
    var feature: Any? = null

    constructor() { }

    constructor(name: String?, age: Int, feature: Any?) {
        this.name = name
        this.age = age
        this.feature = feature
    }
}

如果只有一个构造方法,可简化为(去掉constructor和括号)

class Person(var name: String, var age: Int, var feature: Any)

2. 代码块等价

• 如果在该构造函数中无其他操作，则继续简化为

class Person(var name: String, var age: Int, var feature: Any)

• 如果有其他操作，则写在init中

class Person(var name: String, var age: Int, var feature: Any) {
    init {
        println("Hello $name")
    }
}