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Similarities Between Java and C++

Both are very successful and popular programming languages. Though there are many differences between the both, there are considerable similarities which are given as follows:

1. Both C++ and Java support Object Oriented Programming

 OOPs is a modular approach, which allows the data to be applied within a stipulated program area, It also provides the re-usability feature to develop productive logic, which means giving more emphasis on data. It supports classes and objects. Oops, features include:

2. Similar syntax

The syntax of C++ and Java is very similar. The syntax of comments between Java and C++ is identical and most used conditional statements are also similar.

Example:




// C++ program to show similar syntax
#include <iostream>
 
using namespace std;
 
int main() {
   
    cout<<"Hello World\n";
   
    return 0;
}




//Java program to print Hello World
import java.io.*;
 
class GFG {
   public static void main(String[] args)
    {
        // prints Hello World
        System.out.println(" Hello World ");
    }
}

Output
Hello World

3. Comments Syntax are identical

Both the single and multiple-line comments are written as //…. and /* …. */ respectively.

Example:




// C++ Program to demonstrate
// Comments
#include <iostream>
using namespace std;
 
// main() is where program execution begins
int main()
{
    int a = 5, b = 10, sum;
    sum = a + b;
 
    /* This will add the values of a and b
    and will display the output stored in sum */
    cout << sum;
    return 0;
}




// Java Program to demonstrate
// Comments
import java.io.*;
 
public class GFG {
    // main() is where program execution begins
    public static void main(String[] args)
    {
        int a = 5, b = 10, sum;
        sum = a + b;
 
        /* This will add the values of a and b
        and will display the output stored in sum */
        System.out.println(sum);
    }
}

Output
15

4. The loops and conditional statements

The loops (like while, for, etc.) and conditional statements (like if-else, switch, etc.) are similar.

Example:




// C++ program to show Loops
// And Conditional Statements
#include <iostream>
using namespace std;
 
int main()
{
    int a = 5, b = 10;
    if (a > b)
        cout << a;
 
    else
        cout << b;
    return 0;
}




// Java program to show use loops
// and conditional statement
public class firstjava {
 
    public static void main(String[] args)
    {
        // to display the greater number
 
        int a = 5, b = 10;
        if (a > b)
            System.out.println(a);
 
        else
            System.out.println(b);
    }
}

Output
10

5. Both have the same arithmetic and relational operators.

Arithmetic operators such as +, -, *, /
Relational operators such as >, <, =, != (not equal to)

6. Execution of both the C++ and Java programs starts from the main function

It is the entry point of the execution of the program. However, the function declaration is different, but the name is the same. 

Example:




// C Program to show use of main function
#include <iostream>
using namespace std;
 
int main() {
 
    cout << "Hello World\n";
    return 0;
}




/*package whatever //do not write package name here */
 
import java.io.*;
 
class GFG {
    public static void main (String[] args) {
        System.out.println("GFG!");
    }
}

Output
Hello World

7. Similar Statement Ending

Statement in both the C++ and Java programs ends with a semi-colon(;).

Example:




//C++ program statements ends with Semicolons (;)
 
#include <iostream>
using namespace std;
 
int main(){
    cout <<"GEEKSFORGEEKS";
    return 0;
}
 
//This code is contributed by Susobhan AKhuli




//Java program statements ends with Semicolons (;)
 
import java.io.*;
 
class GFG {
    public static void main (String[] args) {
        System.out.println("GEEKSFORGEEKS");
    }
}
 
//This code is contributed by Susobhan AKhuli

Output
GEEKSFORGEEKS

8. Both have the same primitive data types

These include datatypes like int, float, char, double, etc. with some differences like the Boolean data type is called boolean in Java but it is called bool in C++. 

9. Similar Keywords 

Many keywords of both the languages are same. Let us check some of the keywords.

Example:

break, continue, char, double, new, public, private, return, static etc. 

10. Both have multi-threading support

Both allow executing multiple threads(sub-processes) simultaneously to achieve multitasking.

11. Areas of Application

C++ is best suitable for developing large software like Library management systems, Employee management systems, Passenger reservation systems, etc. Java can be used to develop all these software but in addition to this Java is best suitable for developing Communication/Internet application software. eg: Network protocols, Internet programs, Web pages, Web browsers, etc.


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