initialize object directly in java

Question

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

such as:

String str=\"something...\";

I wan

Answer 1

It is possible with the keyword new and using constructors, but not like the String, that is a very special kind of object.

Answer 2

    package com.company;

public class InitializationOfObject {
    int a ;
    int b ;

    InitializationOfObject(){
    }

    InitializationOfObject( int r , int n){
        this.a = r;
        this.b = n;
        System.out.println("Object initialization by constructor  ");
    }

    void methodInitialization(int k, int m){
        System.out.println("object initialization via method");
        this.a = k;
        this.b = m;
    }

    void display(){
        System.out.println("k = " +a+ "m = "+b);
    }

    public static void main(String... arg){
        InitializationOfObject io = new InitializationOfObject();
        InitializationOfObject io2 = new InitializationOfObject(45,65);
        io.a = io2.a;
        io.b = io2.b;
        io.display();

        io.methodInitialization(34,56);
        io.display();

        io.a = 12;
        io.b = 24;
        System.out.println("object initialization via refrence");
        System.out.println("a = "+io.a+" "+ " b ="+io.b);
    }

}

//Object initializatian by construtor

k = 45m = 65

object initializaion via method

k = 34m = 56

object initialization via reference

a = 12  b =24

Answer 3

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

Here's the constructor version:

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
}

which is used like this:

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

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!

Answer 4

You have to make a constructor method for the object, which takes in parameters of the fields you want values for.

Example:

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

Then in the class you want this:

myClass class = new myClass(24, "name");