常用数值转换

常用数值转换

package tools;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/*
 * public int stringToInt(String str)***主要方法      int i=Integer.parseInt(str);;       String 转换为Int
 * public String intToString(int i)===主要方法        String str=Integer.toString(i);     Int转换为String
 * public float strTofloat(String str)***主要方法     Float fnum=Float.parseFloat(str)    String转换为Float
 * public String floatToStr(Float fnum)***主要方法    String str=Float.toString(fnum);//  Float转换为String
 * public static Double strToDouble(String str)***      String转换为Double
 * public static String doubleToStr(Double dnum)//		Double转换为String
 * public static String dateToString(Date date)         将date类型转换为String类型
 * public static Date stringToDate(String str)          将String类型转换为日期类型
 * public static java.sql.Date uDateToSqlDate(java.util.Date udate)             将java.util.date类型转换为java.sql.date类型
 */
public class StrTools {

		//String 转换为Int
		public static int stringToInt(String str){
			int i = 0;
			try{
				i=Integer.parseInt(str);
			}catch(Exception e){
				e.printStackTrace();
				i=-1;
			}
			return i;
		}
		//Int转换为String
		public static String intToString(int i){
			String str="";
			try {
				str=Integer.toString(i);
			} catch (RuntimeException e) {
				e.printStackTrace();
				str="";
			}
			return str;
		}
		//String转换为Float
		public static float strTofloat(String str){
			float fnum=0;
			try {
				fnum=Float.parseFloat(str);
			} catch (NumberFormatException e) {
				e.printStackTrace();
				fnum=-1;
			}
			return fnum;
		}
		//	Float转换为String
		public static String floatToStr(Float fnum){
			String str="";
			try {
				str=Float.toString(fnum);
			} catch (NumberFormatException e) {
				e.printStackTrace();
			}
			return str;
		}
		//		String转换为Double
		public static Double strToDouble(String str){
			Double dnum = null;
			try {
				dnum=Integer.valueOf(str).doubleValue();
			} catch (NumberFormatException e) {
				e.printStackTrace();
			}
			return dnum;
		}
		//		Double转换为String
		public static String doubleToStr(Double dnum){
			String str="";
			try {
				str=Double.toString(dnum);
			} catch (NumberFormatException e) {
				e.printStackTrace();
			}
			return str;
		}
//		将date类型转换为String类型
		public static String dateToString(Date date){
			String dateStr="";
			if(date!=null){
			SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd");
			dateStr=sf.format(date);
			}
			return dateStr;
		}
//		将String类型转换为日期类型
		public static Date stringToDate(String str){
			SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
			Date date=null;
			if(str==null||str.length()<8)
				return null;
			try{
				date=sdf.parse(str);
			}catch(ParseException e){
				e.printStackTrace();
			}
			return date;
		}
//		将java.util.date类型转换为java.sql.date类型		
		public static java.sql.Date uDateToSqlDate(java.util.Date udate){
			java.sql.Date date=null;
			try {
				date=new java.sql.Date(udate.getTime());
			} catch (RuntimeException e) {
				e.printStackTrace();
			}
			return date;	
		}
		public static void main(String []args){
			Date date=StrTools.stringToDate("2009-01-01");
			System.out.println(date);
			
			String dates=StrTools.dateToString(date);
			System.out.println(dates);
		}

}