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);

Sample Output:

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


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

Java Code Editor:

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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";
    catch (Exception e) {