如何检查一个字符串是否包含空格字符、空白字符或 " "。如果可能,请提供一个Java示例。
例如:String = "test word";
boolean containsWhitespace = str.contains(" ");
import java.util.Scanner;
public class camelCase {
public static void main(String[] args)
{
Scanner user_input=new Scanner(System.in);
String Line1;
Line1 = user_input.nextLine();
int j=1;
//Now Read each word from the Line and convert it to Camel Case
String result = "", result1 = "";
for (int i = 0; i < Line1.length(); i++) {
String next = Line1.substring(i, i + 1);
System.out.println(next + " i Value:" + i + " j Value:" + j);
if (i == 0 | j == 1 )
{
result += next.toUpperCase();
} else {
result += next.toLowerCase();
}
if (Character.isWhitespace(Line1.charAt(i)) == true)
{
j=1;
}
else
{
j=0;
}
}
System.out.println(result);
String.contains
:public static boolean containWhitespace(String value) {
return value.contains(" ");
}
public static void main(String[] args) {
System.out.println(containWhitespace("i love potatoes"));
System.out.println(containWhitespace("butihatewhitespaces"));
}
输出:
true
false
使用org.apache.commons.lang.StringUtils。
boolean withWhiteSpace = StringUtils.contains("my name", " ");
StringUtils.deleteWhitespace(null) = null StringUtils.deleteWhitespace("") = "" StringUtils.deleteWhitespace("abc") = "abc" StringUtils.deleteWhitespace(" ab c ") = "abc"
package com.test;
public class Test {
public static void main(String[] args) {
String str = "TestCode ";
if (str.indexOf(" ") > -1) {
System.out.println("Yes");
} else {
System.out.println("Noo");
}
}
}