public static boolean isInteger(String str) { if (str == null) { return false; } int length = str.length(); int i = 0; // set the length and value for highest positive int or lowest negative int int maxlength = 10; String maxnum = String.valueOf(Integer.MAX_VALUE); if (str.c...
importjava.util.Scanner;publicclassNumberRangeCheck{publicstaticvoidmain(String[]args){Scannerscanner=newScanner(System.in);System.out.println("请输入一个数字:");StringnumStr=scanner.nextLine();if(numStr.matches("[0-9]+")&&Integer.parseInt(numStr)>=0&&Integer.parseInt(numStr)<=100){System.ou...
Using this method we can determine if we can parseStringinto anInteger: String string ="25";if(StringUtils.isNumeric(string)) { System.out.println("String is numeric!"); }else{ System.out.println("String isn't numeric."); } StringUtils.isNumericSpace() ...
Steps to check if a given number is the perfect number using while loop Following are the steps to check if a given number is the perfect number using while loop − Import the classes fromjava.util package. Declare and initialize an integer variablen1for the number to check and another int...
In this tutorial, we will write a java program to check if a given number is perfect square. Java Example to check if a number is perfect square In this program, we have created a user-defined method checkPerfectSquare() that takes a number as an argumen
This program will determine whether or not the integer is divisible by 2. If the number is divisible, it is an even number; otherwise, it is an odd number.Check if a Number Is Odd or Even in JavaWe’ll explore how to verify whether a number is even or odd when it’s user-defined...
In the following Java program, we will use if-else block to check if the given integer variable is a positive number or negative.Open Compiler public class Example1 { public static void main(String[] args) { int myInput = 788; System.out.println("The given number is: " + myInput);...
After traversing the string we check the status of the flag if it is true then we will print the current input as a valid integer.public class StudyTonight { public static void main(String[] args) { String input = "1234"; Boolean flag=true; for(int a=0;a...
Write a Java program to check if a positive number is a palindrome or not. Pictorial Presentation: Sample Solution: Java Code: importjava.util.*;publicclasstest{publicstaticvoidmain(String[]args){intnum;// Create a Scanner object for user inputScannerin=newScanner(System.in);// Prompt the ...
intanswer=Integer.parselnt(answerString); //4.Gradetheannseranddisplaytheresult StringreplyString; if(numberl+number2==answer) replyString=Youarecorrect!; else replyString=YouransweriswrongAn+numberl++” +number?+“shouldbe+(numberl+number2); ...