字符串格式化工具类StringFormat

public class StringFormat {public static String isNotNullAndEmptyString(String str) {String string = "";if (str != null) {string = str.trim();}return string;}public static double isNotNullAndEmptyToDouble(String str) {double d = 0;if (str != null && !str.equals("")) {d = Double.parseDouble(str.trim());}return d;}public static int isNotNullAndEmptyToInteger(String str) {int i = 0;if (str != null && !str.equals("")) {i = Integer.parseInt(str.trim());}return i;}public static boolean isNullAndEmpty(String string){boolean  bool = false;if(string==null||string.equals("")){bool = true;}return bool;}}