Home Question how to check if string contains '+' character You need this instead:if(s.contains("+")) contains() method of String class does not take regular expression as a parameter, it takes normal text.EDIT:String s = "ddjdjdj+kfkfkf"; if(s.contains("+")) { String parts[] ...
contains() Return Value returns trueif the string contains the specified character returns falseif the string doesn't contain the specified character Example 1: Java String contains() classMain{publicstaticvoidmain(String[] args){ String str1 ="Learn Java"; Boolean result;// check if str1 con...
This method returns a boolean value based on whether the substring exists in the this string or not. The contains() method searches the substring across the original string and returns true if and only if this string contains the specified sequence of character values, and false otherwise. Here...
// Importing the required Java utilities package import java.util.*; // Defining a class named Solution public class Solution { // Method to check if one string contains another string public static boolean is_str_contains(String str1, String str2) { // Checking if either of the input s...
string.intln1=samp_str.length();intln2=pat_str.length();// Check if the given string is smaller than the pattern string.if(ln1<ln2){System.out.println("No such window can exist");return"";}// Initialize arrays to store character frequencies.intgvn_strg[]=newint[256];intpat_stgr...
str - the String to check, may be null Returns: true if only contains digits, and is non-null 上面三种方式中,第二种方式比较灵活。 第一、三种方式只能校验不含负号“-”的数字,即输入一个负数-199,输出结果将是false; 而第二方式则可以通过修改正则表达式实现校验负数,将正则表达式修改为“^-?[0-...
public class Main { public static boolean containsOnlyNumbers(String str) { for (int i = 0; i < str.length(); i++) { if (!Character.isDigit(str.charAt(i))) return false; }/*from ww w . j av a 2 s.com*/ return true; } public static void main(String[] args) { S...
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We’ve created aStringcontaining all special characters we need and then checked if it contains our specific character. 4. Conclusion In this quick article, we’ve shown how to check if aStringcontains required characters.In the first scenario, we used regular expressions while in the second we...
// Java Program to Check Whether String contains Special // Characters Using Character Class // Importing input output classes import java.io.*; // Main class class GFG { // Method 1 // Main driver method public static void main(String[] args) { // Declaring and initializing count for ...