Java字符串大小写转换 public static void main(String[] args) {
String ss = "AS" ;
String ss1 = "" ;
String st = "" ;
for(int i=0;i<ss.length();i++){
//大写变小写
if(ss.charAt(i)>='A'&&ss.charAt(i)<='Z'){
ss1 = ss.substring(i,i+1).toLowerCase();
st+=ss1;
}
//小写变大写
if(ss.charAt(i)>='a'&&ss.charAt(i)<='z'){
ss1 = ss.substring(i,i+1).toUpperCase();
st+=ss1;
}
}
System.out.println(st);
}
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