题解 | #字符串加解密#

String enc = sc.nextLine();
        String  dec = sc.nextLine();
        StringBuffer encBuffer = new StringBuffer();
        StringBuffer decBuffer = new StringBuffer();

        for(int i=0;i<enc.length();i++){
             if('a'<=enc.charAt(i)&&enc.charAt(i)<'z'){
                 encBuffer.append((char)(enc.charAt(i)-31)+"");
             }else if(enc.charAt(i)=='z'){
                 encBuffer.append((char)(enc.charAt(i)-57)+"");
             }else if('A'<=enc.charAt(i)&&enc.charAt(i)<'Z'){
               encBuffer.append((char)(enc.charAt(i)+33)+"");
             }else if(enc.charAt(i)=='Z'){
                 encBuffer.append((char)(enc.charAt(i)+7)+"");  
             }else if('0'<=enc.charAt(i)&&enc.charAt(i)<'9'){
               encBuffer.append((char)(enc.charAt(i)+1)+"");
             }else if(enc.charAt(i)=='9'){
                 encBuffer.append((char)(enc.charAt(i)-9)+"");  
             }
        }
        System.out.println(encBuffer.toString());

        for(int i=0;i<dec.length();i++){
             if('a'<dec.charAt(i)&&dec.charAt(i)<='z'){
                 decBuffer.append((char)(dec.charAt(i)-33)+"");
             }else if(dec.charAt(i)=='a'){
                 decBuffer.append((char)(dec.charAt(i)-7)+"");
             }else if('A'<dec.charAt(i)&&dec.charAt(i)<='Z'){
               decBuffer.append((char)(dec.charAt(i)+31)+"");
             }else if(dec.charAt(i)=='A'){
                 decBuffer.append((char)(dec.charAt(i)+57)+"");  
             }else if('0'<dec.charAt(i)&&dec.charAt(i)<='9'){
               decBuffer.append((char)(dec.charAt(i)-1)+"");
             }else if(dec.charAt(i)=='0'){
                 decBuffer.append((char)(dec.charAt(i)+9)+"");  
             }
        }
        System.out.println(decBuffer.toString());