如何在Java中在大写和小写之间转换字符串？
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How do I convert strings between uppercase and lowercase in Java?
提问by Nanda
What is the method for converting strings in Java between upper and lower case?
Java中字符串大小写转换的方法是什么？
采纳答案by PeterMmm
String#toLowerCaseand String#toUpperCaseare the methods you need.
String#toLowerCase和String#toUpperCase是您需要的方法。
回答by Fortega
回答by Thorbj?rn Ravn Andersen
Yes. There are methods on the String itself for this.
是的。为此，String 本身有一些方法。
Note that the result depends on the Locale the JVM is using. Beware, locales is an art in itself.
请注意，结果取决于 JVM 使用的区域设置。请注意，语言环境本身就是一门艺术。
回答by Crickey
There are methods in the String class; toUppercase()and toLowerCase().
String类中有方法；toUppercase()和toLowerCase()。
i.e.
IE
String input = "Cricket!";
String upper = input.toUpperCase(); //stores "CRICKET!"
String lower = input.toLowerCase(); //stores "cricket!"
This will clarify your doubt
这将澄清你的疑惑
回答by zubin patel
Coverting the first letter of word capital
覆盖单词大写的第一个字母
input:
输入：
hello world
你好，世界
String A = hello;
String B = world;
System.out.println(A.toUpperCase().charAt(0)+A.substring(1) + " " + B.toUpperCase().charAt(0)+B.substring(1));
Output:
输出：
Hello World
你好，世界
回答by Jaime Montoya
Assuming that all characters are alphabetic, you can do this:
假设所有字符都是字母，你可以这样做：
From lowercase to uppercase:
从小写到大写：
// Uppercase letters.
class UpperCase {
public static void main(String args[]) {
char ch;
for(int i=0; i < 10; i++) {
ch = (char) ('a' + i);
System.out.print(ch);
// This statement turns off the 6th bit.
ch = (char) ((int) ch & 65503); // ch is now uppercase
System.out.print(ch + " ");
}
}
}
From uppercase to lowercase:
从大写到小写：
// Lowercase letters.
class LowerCase {
public static void main(String args[]) {
char ch;
for(int i=0; i < 10; i++) {
ch = (char) ('A' + i);
System.out.print(ch);
ch = (char) ((int) ch | 32); // ch is now uppercase
System.out.print(ch + " ");
}
}
}
