将字符转换为大写 [英] Converting a char to uppercase

问题描述

String lower = Name.toLowerCase();
int a = Name.indexOf(" ",0);
String first = lower.substring(0, a);
String last = lower.substring(a+1);
char f = first.charAt(0);
char l = last.charAt(0);
System.out.println(l);

如何获得F和L变量转换为大写。

how would i get the F and L variables converted to uppercase.

推荐答案

您可以使用 Character＃toUpperCase（） 。

You can use Character#toUpperCase() for this.

char fUpper = Character.toUpperCase(f);
char lUpper = Character.toUpperCase(l);

它有一些限制，因为世界知道更多的字符， code> char 范围。另请参阅以下摘录 javadoc ：

It has however some limitations since the world is aware of many more characters than can ever fit in 16bit char range. See also the following excerpt of the javadoc:

注意：此方法无法处理补充字符。要支持所有Unicode字符（包括补充字符），请使用 toUpperCase（int） 方法。

Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the toUpperCase(int) method.

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