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pass by value in java

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Disgusted Dugong answered on September 10, 2022 Popularity 7/10 Helpfulness 1/10

answer pass by value in java

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pass by value in java

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pass by value for array in java

class PassByValue 
{

  public static void main(String[] args) 
  {
    Integer[] array = new Integer[2];
    array[0] = 2;
    array[1] = 3;
    add(array);
    System.out.println("Result from main: " + (array[0] + array[1]));
  }

  private static void add(Integer[] array) {
    array[0] = 10;
    System.out.println("Result from method: " + (array[0] + array[1]));
  }
}

Popularity 7/10 Helpfulness 1/10 Language java

Source: www.scaler.com

Tags: java pass-by-value

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Contributed on Mar 18 2023

Disgusted Dugong

0 Answers Avg Quality 2/10

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// Java is always pass-by-value. When passing a reference variable, 
// a copy of the value of the pointer was passed, not the object itself. 

import java.util.Arrays;
class Dog {
    public String name;
    public Dog() {}     //default constructor
    public Dog(String name) {this.name = name;}
}
public class Main {
    public static void update_obj(Dog myDog) {
        myDog.name = "Changed";
    }
    public static void update_obj_v2(Dog myDog) {
        myDog = new Dog();
        myDog.name = "Changed v2";
    }
    public static void update_int(int i) {i++;}
    public static void update_Integer(Integer i) {i++;}
    public static void update_String_to_lower(String str) {str.toLowerCase();}
    public static void update_array(String[] ary) {ary[0] = "Changed";}

    public static void main(String[] args) {

        // ---------- Custom mutable objects, arrays, changed --------------------------------
        Dog max = new Dog("Max");
        update_obj(max);
        System.out.println("Dog's name is now: " + max.name);   //Changed

        Dog fido = new Dog("Fido");
        Dog fido_alias = fido;
        update_obj_v2(fido);
        System.out.println("Dog's name is now (v2): " + fido.name);     // Fido
        System.out.println("Fido object address has not changed (v2): " + String.valueOf(fido == fido_alias));  // True

        String[] fruits = {"Apple", "Orange"};
        update_array(fruits);
        System.out.println(Arrays.toString(fruits));    // [Changed, Orange]

        // ---------- Primitives, Immutable objects, NOT changed ------------------------------
        int i = 1;
        System.out.println("int before update: " + i); // 1
        update_int(i);
        System.out.println("int after update: " + i);  // 1

        Integer j = 1;
        System.out.println("Integer j before update: " + j); // 1
        update_Integer(j);
        System.out.println("Integer j after update: " + j);  // 1

        Integer k = 2;
        k++;
        System.out.println(k);      // 3

        String word = "SDSE";
        System.out.println("String before update: " + word);    //SDSE
        update_String_to_lower(word);
        System.out.println("String after update: " + word);     //SDSE
    }
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: java

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Contributed on Sep 10 2022

Grotesque Gibbon

0 Answers Avg Quality 2/10

pass by value in java

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