void (@NotNull PsiElement element, @NotNull ActionContext context, @NotNull ModPsiUpdater updater) { final GrLiteral exp = (GrLiteral)element; @NonNls String textString = exp.getText().replaceAll("_", ""); final int textLength = textString.length(); final char lastChar = textString.charAt(textLength - 1); final boolean isLong = lastChar == 'l' || lastChar == 'L'; if (isLong) { textString = textString.substring(0, textLength - 1); } final BigInteger val; if (textString.startsWith("0x") || textString.startsWith("0X")) { final String rawIntString = textString.substring(2); val = new BigInteger(rawIntString, 16); } else if (textString.startsWith("0b") || textString.startsWith("0B")) { final String rawString = textString.substring(2); val = new BigInteger(rawString, 2); } else { final String rawIntString = textString.substring(1); val = new BigInteger(rawIntString, 8); } String decimalString = val.toString(10); if (isLong) { decimalString += 'L'; } PsiImplUtil.replaceExpression(decimalString, exp); }