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Java Exercises: Convert a string to an integer in Java

Java Basic: Exercise-51 with Solution

Write a Java program to convert a string to an integer in Java.

Sample Solution:

Java Code:

import java.util.*;
public class Exercise51 {

 public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input a number(string): ");
        String str1 = in.nextLine();
		int result = Integer.parseInt(str1);
        System.out.printf("The integer value is: %d",result);
		System.out.printf("\n");
    }
}

Sample Output:

Input a number(string): 25                                             
The integer value is: 25

Flowchart:

Flowchart: Java exercises: Convert a string to an integer in Java

Java Code Editor:

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Previous: Write a Java program to print numbers between 1 to 100 which are divisible by 3, 5 and by both.
Next: Write a Java program to calculate the sum of two integers and return true if the sum is equal to a third integer.

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Java: Tips of the Day

Execution of console commands:

Java allows you to execute console commands directly from code using a class Runtime. It is very important not to forget about exception handling.

For example, let's try to open a PDF file through a Java terminal:

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
  
public class ShellCommandExec {
  
  public static void main(String[] args) {
    String gnomeOpenCommand = "gnome-open //home//user//Documents//MyDoc.pdf";
  
    try {
      Runtime rt = Runtime.getRuntime();
      Process processObj = rt.exec(gnomeOpenCommand);
  
      InputStream stdin = processObj.getErrorStream();
      InputStreamReader isr = new InputStreamReader(stdin);
      BufferedReader br = new BufferedReader(isr);
  
      String myoutput = "";
  
      while ((myoutput=br.readLine()) != null) {
        myoutput = myoutput+"\n";
      }
      System.out.println(myoutput);
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}