java 将备用字符转换为大写
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Convert alternate char to uppercase
提问by sam007
I am new to java programming. I want to print a string with alternate characters in UpperCase.
我是java编程的新手。我想用大写的替代字符打印一个字符串。
String x=jTextField1.getText();
x=x.toLowerCase();
int y=x.length();
for(int i=1;i<=y;i++)
{}
I don't know how to proceed further. I want to do this question with the help of looping and continue function. Help would be appreciated. Thanks.
我不知道如何进一步。我想借助循环和继续功能来解决这个问题。帮助将不胜感激。谢谢。
回答by davesbrain
@Test
public void alternateUppercase(){
String testString = "This is a !!!!! test - of the emergency? broadcast System.";
char[] arr = testString.toLowerCase().toCharArray();
boolean makeUppercase = true;
for (int i=0; i<arr.length; i++) {
if(makeUppercase && Character.isLetter(arr[i])) {
arr[i] = Character.toUpperCase(arr[i]);
makeUppercase = false;
} else if (!makeUppercase && Character.isLetter(arr[i])) {
makeUppercase = true;
}
}
String convertedString = String.valueOf(arr);
System.out.println(convertedString);
}
回答by Peter Lawrey
Strings start at index 0 and finish at index x.length()-1
字符串从索引 0 开始并在索引处结束 x.length()-1
To look up a String by index you can use String.charAt(i)
要按索引查找字符串，您可以使用 String.charAt(i)
To convert a character to upper case you can do Character.toUpperCase(ch);
要将字符转换为大写，您可以执行以下操作Character.toUpperCase(ch)；
I suggest you build a StringBuilderfrom these characters which you can toString()when you are done.
我建议你StringBuilder从这些角色中构建一个，toString()当你完成时你可以。
回答by Elliott Frisch
First, java indexes start at 0(not 1). I think you are asking for something as simple as alternating calls to Character.toLowerCase(char)and Character.toUpperCase(char)on the result of modulo(remainder of division) 2.
首先，java 索引从0(not 1)开始。我认为您要求的只是对模（除法的余数）2的结果进行交替调用Character.toLowerCase(char)和Character.toUpperCase(char)对结果的调用一样简单。
String x = jTextField1.getText();
for (int i = 0, len = x.length(); i < len; i++) {
char ch = x.charAt(i);
if (i % 2 == 0) {
System.out.print(Character.toLowerCase(ch));
} else {
System.out.print(Character.toUpperCase(ch));
}
}
System.out.println();
回答by roeygol
you can make it using the 65 distnace of lower case and upper case ABCabc from the unicode table like:
您可以使用来自 unicode 表的小写和大写 ABCabc 的 65 距离来制作它，例如：
String str = "abbfFDdshFSDjdFDSsfsSdoi".toLowerCase();
char c;
boolean state = false;
String newStr = "";
for (int i=0; i<str.length(); i++){
c = str.charAt(o);
if (state){
newStr += c;
}
else {
newStr += c + 65;
}
state = !state;
}
回答by bakoyaro
I'm sure there is a slicker way to do this, but this will work for a 2 minute-answer:
我确信有一种更巧妙的方法可以做到这一点，但这将在 2 分钟内有效：
public String homeWork(){
String x = "Hello World";
StringBuilder sb = new StringBuilder();
for(int i=0;i<=x.length();i++){
char c = x.charAt(i);
if(i%2==0){
sb.append(String.valueOf(c).toUpperCase());
} else {
sb.append(String.valueOf(c).toLowerCase());
}
}
return sb.toString();
}
To explain i%2==0, if the remainder of i divided by 2 is equal to zero (even numbered) return true
解释 i%2==0，如果 i 除以 2 的余数等于 0（偶数），则返回 true
回答by java.manish.2015
public class PrintingStringInAlternativeCase {
public static void main(String s[])
{
String testString = "TESTSTRING";
String output = "";
for (int i = 0; i < testString.length(); i++) {
if(i%2 == 0)
{
output += Character.toUpperCase(testString.toCharArray()[i]);
}else
{
output += Character.toLowerCase(testString.toCharArray()[i]);
}
}
System.out.println("Newly generated string is as follow: "+ output);
}
}
回答by Matt
Using as much of your code as I could, here's what I got. First I made a string called build that will help you build your resulting string. Also, I changed the index to go from [0,size-1] not [1,size]. Using modulo devision of 2 helps with the "every other" bit.
尽可能多地使用你的代码，这就是我得到的。首先，我创建了一个名为 build 的字符串，它将帮助您构建生成的字符串。另外，我将索引从 [0,size-1] 改为 [1,size]。使用 2 的模除法有助于“每隔一个”位。
String build =""
String x=jTextField1.getText();
x=x.toLowerCase();
int y=x.length();
for(int i=0;i<y;i++)
{
if(i%2==0){
build+=Character.toUpperCase(x.charAt(i));
else{
build+=x.charAt(i);
}
}
x=build; //not necessary, you could just use build.
Happy oding! Leave a comment if you have any questions.
奥丁快乐！如果您有任何问题，请发表评论。
回答by Anne Lingesh
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter Stirng");
String str=sc.nextLine();
for(int i=0;i<str.length();i++)
{
if(i%2==0)
{
System.out.print(Character.toLowerCase(str.charAt(i)));
}
else
{
System.out.print(Character.toUpperCase(str.charAt(i)));
}
}
sc.close();
}
回答by DecipherX
Java 8 Solution:
Java 8 解决方案：
static String getMixedCase(String str) {
char[] chars = str.toCharArray();
return IntStream.range(0, str.length())
.mapToObj(i -> String.valueOf(i % 2 == 1 ? chars[i] : Character.toUpperCase(chars[i])))
.collect(Collectors.joining());
}
