Java program to read user input(String) for an array

String user input in an array

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Java program to read user input(String) for an array

In this article, we will discuss the concept of Java program to read user input(String) for an array

In this post, we are going to learn how to write a program to read string elements in single dimensional array using for, while and do-while loop in Java language

Code to read Strings of an array

Code to read Strings of an array using for loop

In this code, we are going to learn how to read string elements (user input) in single dimensional array using for loop in Java language

Program 1

import java.util.Scanner;
public class InputstringArrayInputfor{
public static void main(String args[]){
//scanner class to read input from the user
  Scanner sc=new Scanner(System.in);
  System.out.print("How many students on your class: ");
  //user input the array length
  int len=sc.nextInt();//Reading the given array length
  //Declaring and creating array
  String[] names=new String[len];
  
  //initializing value to the array
  System.out.println("\n******Initializing Strings of the array******");
  System.out.println("Enter "+names.length+" names of your students");
  
  for(int i=0;  i<names.length; i++){
    System.out.print("Enter name of student for index names["+i+"]:");
    names[i]=sc.next();
     //using the for loop to initializing array
  }
  
  //displaying the array
  System.out.println("\n******displaying given student names******");
  System.out.println("Entered student names are");
 
  for(int i=0; i<names.length; i++){
    //display entered strings using for loop
    System.out.println(names[i]+"\t");
     
  }
}
}

When the above code is executed, it produces the following result

How many students on your class: 4

******Initializing Strings of the array******
Enter 4 names of your students
Enter name of student for index names[0]:Sumi
Enter name of student for index names[1]:Mani
Enter name of student for index names[2]:Kani
Enter name of student for index names[3]:Jeni

******displaying given student names******
Entered students names are:
Sumi
Mani
Kani
Jeni

Code to read Strings of an array using while loop

In this code, we are going to learn how to read string elements (user input) in single dimensional array using while loop in Java language

Program 2

import java.util.Scanner;
public class StringArrayInputwhile{
public static void main(String args[]){
//scanner class to read input from the user
  Scanner sc=new Scanner(System.in);
  System.out.print("How many stuents on your class: ");
  //user input for array length
  int len=sc.nextInt();//Reading the input for array length
  //Declaring and creating string array
  String[] names=new String[len];
  
  //initializing value to the array
  System.out.println("\n******Initializing Strings of the array******");
  System.out.println("Enter "+names.length+" names of your students");
  int i=0; 
  while(i<names.length){
    System.out.print("Enter name of student for index names["+i+"]:");
    names[i]=sc.next();//reading names 
     //using the while loop to initializing array
      i++;
  }
  
  //displaying the array
  System.out.println("\n******displaying given student names******");
  System.out.println("Entered student names are");
  
  i=0;
  while(i<names.length){
  
    //display entered strings using while loop
    System.out.println(names[i]+"\t");
     i++;
  }
}
}

When the above code is executed, it produces the following result

How many students on your class: 5

******Initializing Strings of the array******
Enter 5 names of your students
Enter name of student for index names[0]:Uma
Enter name of student for index names[1]:Kuna
Enter name of student for index names[2]:Hema
Enter name of student for index names[3]:Sema
Enter name of student for index names[4]:Puma

******displaying given student names******
Entered students names are:
Uma
Kuna
Hema
Sema
Puma

Code to read Strings of an array using do-while loop

In this code, we are going to learn how to read string elements (user input) in single dimensional array using do-while loop in Java language

Program 3

import java.util.Scanner;
public class StringArrayInputDowhile{
public static void main(String args[]){
//scanner class to read input from the user
  Scanner sc=new Scanner(System.in);
  System.out.print("How many stuents on your class: ");
  //user input for array length
  int len=sc.nextInt();//Reading the input for array length
  //Declaring and creating string array
  String[] names=new String[len];
  
  //initializing value to the array
  System.out.println("\n******Initializing Strings of the array******");
  System.out.println("Enter "+names.length+" names of your students");
  int i=0; 
  do{
    System.out.print("Enter name of student for index names["+i+"]:");
    names[i]=sc.next();//reading names 
     //using the do-while loop to initializing array
      i++;
  }while(i<names.length);
  
  //displaying the array
  System.out.println("\n******displaying given student names******");
  System.out.println("Entered student names are");
  
  i=0;
  do{
  
    //display entered strings using do-while loop
    System.out.println(names[i]+"\t");
     i++;
  }while(i<names.length);
}
}

When the above code is executed, it produces the following result

How many students on your class: 3

******Initializing Strings of the array******
Enter 3 names of your students
Enter name of student for index names[0]:Balan
Enter name of student for index names[1]:Malan
Enter name of student for index names[2]:Selan


******displaying given student names******
Entered students names are:
Balan
Malan
Selan

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