Java中的“自动增量”字母表？
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"Auto increment" alphabet in Java?
提问by Dacto
"Auto increment" alphabet in Java - is this possible? From A to Z without a third-party library?
Java中的“自动增量”字母表 - 这可能吗？从 A 到 Z 没有第三方库？
采纳答案by Richie
Yes, you can do it like this:
是的，你可以这样做：
for (char alphabet = 'A'; alphabet <= 'Z'; alphabet++) {
System.out.println(alphabet);
}
It is also possible with typecasting:
也可以通过类型转换：
for (int i = 65; i <= 90; i++) {
System.out.println((char)i);
}
回答by Taylor Leese
Yes, like this:
是的，像这样：
for (int i = 0; i < 26; i++)
{
char upper = (char) ('A' + i);
char lower = (char) ('a' + i);
...
}
回答by sdornan
for (char c = 'a'; c <= 'z'; c++)
//whatever
回答by Laurence Gonsalves
for (char c = 'A'; c <= 'Z'; c++) {
...
}
回答by Michel Gokan
You are looking for something like this:
你正在寻找这样的东西：
for( int i = 'a'; i < 'z'; i++ )
System.out.println((char)i); // Cast int to char
回答by raja
for (char alphabet = 'a'; alphabet <= 'z'; alphabet++) {
System.out.println(alphabet);
}
Use this for lowercase alphabets.
将此用于小写字母。
回答by EngineerCoding
Here is a piece of code to see what really is going on (or at least the print out :P):
这是一段代码，用于查看真正发生了什么（或至少打印出来：P）：
for(int i = 0; i < 26; i++)
{
System.out.println((char)('A' + i) + ":" + ('A' + i) + " : " + (char)('a' + i) + ":" + ('z' + i));
}
回答by Massimiliano Giunchi
This is my solutions, just a little more complicated than other examples above, but extendible for other iterations (used pattern iterator):
这是我的解决方案，只是比上面的其他示例稍微复杂一点，但可以扩展为其他迭代（使用模式迭代器）：
class Alphabet implements Iterable<String>{
private char start;
private char end;
public Alphabet(char start, char end) {
this.start=start;
this.end=end;
}
@Override
public Iterator<String> iterator() {
return new AlphabetIterator(start, end);
}
class AlphabetIterator implements Iterator<String>{
private String current;
private String end;
private AlphabetIterator(char start, char end) {
this.current=String.valueOf(--start);
this.end=String.valueOf(end);
}
@Override
public boolean hasNext() {
return (current.charAt(0) < end.charAt(0));
}
@Override
public String next() {
char nextChar = current.charAt(0);
return this.current=String.valueOf(++nextChar);
}
}
public static void main (String[] arg){
for (String str:new Alphabet('B', 'Y')){
System.out.print(str+" ");
}
}
}
Output: B C D E F G H I J K L M N O P Q R S T U V W X Y
输出： BCDEFGHIJKLMNOPQRSTUV WXY
回答by Lukas Eder
Mandatory Java 8 solution:
强制 Java 8 解决方案：
IntStream.rangeClosed('A', 'Z')
.mapToObj(c -> "" + (char) c)
.forEach(System.out::println);
回答by Shiva
Here's the code without a third-party library,
这是没有第三方库的代码，
public class JavaPrintAlphabet
{
public static void main(String[] args)
{
System.out.println("Printing the alphabets from A to Z : ");
char alpha;
for(alpha = 'A'; alpha <= 'Z'; alpha++)
{
System.out.println(alpha);
}
}
}
Output
输出
Printing the alphabets from A to Z : A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
For more on a Java program to print the alphabet, refer this resource.
有关打印字母表的 Java 程序的更多信息，请参阅此资源。
