直接在Java中初始化对象 [英] initialize object directly in java

问题描述

是否可以像在Java中使用String类那样直接初始化对象?

Is that possible to initialize object directly as we can do with String class in java:

例如:

String str="something...";

我想为我的自定义课程做同样的事情:

I want to do same for my custom class:

class MyData{
public String name;
public int age;
}

有可能像

MyClass obj1={"name",24};

或

MyClass obj1="name",24;

初始化对象? 或怎么可能！

to initialize object? or how it can be possible!

推荐答案

通常，您可以使用构造函数，但不必这样做！

Normally, you would use a constructor, but you don't have to!

这是构造函数版本:

public class MyData {
    private String name;
    private int age;

    public MyData(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // getter/setter methods for your fields
}

这样使用:

MyData myData = new MyData("foo", 10);

但是，如果您的字段是protected或public(例如您的示例)，则可以无需定义构造函数.这是Java中最接近您想要的方式:

However, if your fields are protected or public, as in your example, you can do it without defining a constructor. This is the closest way in java to what you want:

// Adding special code for pedants showing the class without a constuctor
public class MyData {
    public String name;
    public int age;
}

// this is an "anonymous class"
MyData myData = new MyData() {
    {
        // this is an "initializer block", which executes on construction
        name = "foo";
        age = 10;
    }
};

Voila！

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