Question

JAVA 输入一个字符串，将大写字母改成小写,小写字母改成大写

JAVA 输入一个字符串，将大写字母改成小写,小写字母改成大写

例如：输入AbCdEf 转换成aBcDeF

Answer 1

//package com.color.program;

public class Change {

public static void main(String[] args){
StringBuffer sb = new StringBuffer();
String s = "AbCdEf";

char[] c = s.toCharArray();
for(int i=0;i<c.length;i++){
if(c[i]>=97){
sb.append((c[i]+"").toUpperCase());
}else{
sb.append((c[i]+"").toLowerCase());
}
}

System.out.println(sb.toString());
}

}

Answer 2

public class TestConverse {
public static void main(String[] args){
String str = "CAds86Ef－";
char[] ch = str.toCharArray();//将字符串转赋给字符数组
str = "";//清空字符串
Character c = null;
for(int i = 0;i < ch.length;i ++){
c = ch[i];
if(c.isUpperCase(ch[i])) str += c.toLowerCase(ch[i]);//如果当前字符为大写，转换为小写
else if(c.isLowerCase(ch[i])) str += c.toUpperCase(ch[i]);//如果当前字符为小写，转换为大写
else str += ch[i];//其它字符不变
}
System.out.println(str);
}
}

Answer 3

String a="AbCdEf";
char[] b=a.toCharArray();
for(int i=0;i<b.length;i++)
{
if(b[i]>97)
b[i]-=32;
else
b[i]+=32;
}
System.out.println(new String (b));

Answer 4

color4you
的简洁，实用!