String str="A"; int a=Integer.valueOf(str).intValue(); System.out.println(str);
で、組んだところ
Exception in thread "main" java.lang.NumberFormatException: For input string: "A" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.valueOf(Unknown Source) at q3.main(q3.java:4)