相关疑难解决方法(0)

这是我下面的代码,它打印J = 74,A = 65,M = 77.如何通过向下移动字母表来打印字符K,B,N？

BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
String string = JOptionPane.showInputDialog( " Please Enter Code " );

for (int i = 0; i < string.length (); ++i) {
    char c = string.charAt(i);
    int j = (int)c;
}


System.out.println("ASCII OF "+c +" = " + j + ".");