将一个字符串中的小写字母变成大写字母,并将大写字母变成小写字母.
package java3;
import java.util.Scanner;
public class t3 { public static String StringChange(String s) {
//if(s.equals(\ // return \没有字符\
StringBuilder sb=new StringBuilder(); int len=s.length(); char c;
for (int i = 0; i < len; i++) {
c=s.charAt(i);
if(c>='a'&&c<='z'){ //小写变大写 c=(char)(c-32);
}else if(c>='A'&&c<='Z'){//大写变小写 c=(char)(c+32); }
sb.append(c); }
return sb.toString(); } public static void main(String[] args) { String s=\ ///System.out.println(\请要转换的英文字符串:\ //Scanner sca=new Scanner(System.in); //String s=sca.next(); //System.out.println(\你输入内容是:\ if(s.equals(\ System.out.println(\没有字符\ else{ System.out.println(\转换后字符串为\ System.out.println(StringChange(s)); }
}
}