并且统计偶数的个数以及偶数的累加和 * * @author tony 18601767221@163.com * @version 2023/8/2 7:03 * @since Java17 */ public class WhileLoopStatement { public static void main(String[] args) { int evenNumberSum = 0; int evenNumberCount = ...
// public String inputNum()// return null// } /** * 判断为数字 */public void judgmentFigures() while (judgeIsNum) System.out.println("请任意输入数字,以空格间隔,以回车结束!") character = scanner.nextLine() char[] figures = character.toCharArray() for (int i = 0; i < figures....
public static boolean PrimeNumber(int N){ boolean Prime = true;final int num =(int)Math.sqrt(N);for(int i=2;i<=num;i++){ if(N%i==0){ Prime = false;break;} } return Prime;} public static void main(String[] args){ Scanner input = new Scanner(System.in);String J...
public class JudgeNumber { public static boolean judgeIsDecimal(String num){boolean isdecimal = false;if (num.contains(".")) { isdecimal=true; }return isdecimal;}public static void main(String[] args) { //测试的main方法int num1 = 34;double num2=67.8;boolean is1 = j...
publicstaticvoidjudgeNumberPhoneStr(Stringstr){Set<String>set=Set.of("work","back","come","deal","desk","book","java","tool","face","watch","match","noise","risky","stock");Map<Integer,String>numberStringMap=Map.of(2,"abc",3,"def",4,"ghi",5,"jkl",6,"mno",7,"pqrs",8...
indexOf(String str) isEmpty() length()方法 lastIndexOf() replace(“被替换”,"替换")方法 split(String regex) substring(int beginIndex) substring(int beginIndex,int endIndex) char[] toCharArray() toLowerCase() toUpperCase() trim() valueOf() ...
To avoid exceptions, I want to judge whether a string is a valid number(integer) before parsing it. Could you please tell me the methods for doing this? Thanx. Cindy Glass "The Hood" Posts: 8521 posted 23 years ago Put it in a try catch block <PRE> try{ int i = Integer....
1 import javax.swing.JOptionPane;public class TestClass1 { public static void main(String[] args) { int number = Integer.parseInt(JOptionPane.showInputDialog("Enter a integer:"));if (number % 5 == 0 && number % 6 == 0)JOptionPane.showMessageDialog(null, number + " is ...
nil对象调方法返回的是nil(这种做法,仁者见仁,智者见智);kotlin和swift通过optional机制,通过编程过程中强化...[用法] Empty string judge 在判断一个字符串是否为空时,我们一般是这样写的: // 判断不为空 if (str != null && !...isEmpty()) { // str is empty, do something } 其实不然,上面的...
public boolean judgeWanShu(int number){//判断是否值完数,是完数则返回true,不是则返回false int sum = 0; for (int index = 1;index<=number/2;index++){//因为一个数,大于其本身的因数只有这个数本身, if(number%index == 0) { //所以我们只需要遍历到这个数的一半即可。