计算字符串中的字符
问题描述:
我是Java新手,我想知道如何计算字符串Hello
中的l
s的数量? 任何帮助将非常感激。计算字符串中的字符
public int countChar(String s, char c)
{
String st= s;
char ch =c;
int counter = 0;
for(int i=0; i<st.length(); i++)
{
if(st.charAt(i) == ch)
{
counter++;
}
}
return counter;
}
public static void main(String[] args)
{
new Loop().countChar("Hello", 'l');
}
答
这应该是您正常工作 - 如果你想打印结果,改变main
这样:
public static void main(String[] args)
{
int count = new Loop().countChar("Hello", 'l');
System.out.println("The count is: " + count);
}
+0
感谢您的重播。对此,我真的非常感激。 – user1172575 2012-02-21 01:29:00
答
尝试用下面的代码:
公共类CharacterCout {
public static int getCharacterCount(String string, char character) {
int counter = 0;
for(int i=0;i<string.length();i++) {
if(string.charAt(i)==character){
counter++;
}
}
return counter;
}
public static void main(String[] args) {
String string = "Hello World!";
char character = 'l';
System.out.println("Character "+character+" count: " +getCharacterCount(string, character));
}
}
答
public String twoOccurrences(String stringa, char stringb) {
int counter = 0;
for (int i = 0; i < stringa.length(); i++) {
if (stringa.charAt(i) == stringb) {
counter++;
}
}
if (counter >= 1) {
return "" + counter;
} else {
return "There is no matching letters";
}
}
public void testOcurrences() {
char stringb = 'a';
String stringa = "Banana";
System.out.println("String a is :" + stringa);
System.out.println("String b is :" + stringb);
String occurrence = twoOccurrences(stringa, stringb);
System.out.println("There is " + occurrence + " '" + stringb + "' in " + stringa);
}
}
答案是2 :)无论如何,具体是什么不工作这段代码? – Ryan 2012-02-21 01:15:22
那么你发布的代码有什么问题? :) – Alfabravo 2012-02-21 01:16:29
如果您想知道为什么没有打印到控制台,您不打印任何内容到控制台('System.out.println')。 – 2012-02-21 01:18:03