c + "的小写字母是" + (char) (i + 32) +

public class DaXiaoXie {
public static void main(String[] args) {
int i = 66;
DaXiaoXie dxx = new DaXiaoXie();
dxx.print(i, (char)i);
dxx.print((char)i, i);
}

public void print(int i, char c) {
    System.out.println("在ASCII表中，" + i + "对应的大写字母是" + c + "。");
}

public void print(char c, int i) {
    System.out.println(c + "的小写字母是" + (char) (i + 32) + "。");
}

}