Java程序使用循环从A到Z显示字符

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在此程序中，您将学习如何在Java中使用for循环打印英文字母。您还将学习只打印大写和小写字母。

Example1：使用for循环显示大写的A到Z

public class Characters {
　　　　public static void main(String[] args) {
　　　　　　　　char c;
　　　　　　　　for(c = 'A'; c <= 'Z';　++c)
　　　　　　　　　　　　System.out.print(c　+　"");
　　　　}
}

When running the program, the output is:

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

You can iterate from A to Z using a for loop because they are stored as ASCII characters in Java.

Therefore, inside, you can65to90 to print English letters.

Just a slight modification can display lowercase letters, as shown in the following example.

Example2: Display lowercase a to z using for loop

public class Characters {
　　　　public static void main(String[] args) {
　　　　　　　　char c;
　　　　　　　　for(c = 'a'; c <= 'z';　++c)
　　　　　　　　　　　　System.out.print(c　+　"");
　　　　}
}

When running the program, the output is:

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

You just need to replace 'A' with 'a' and 'Z' with 'z' to display lowercase letters. In this case, you will iterate through the97to122.

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