public class testformat { public static void main(String args[]) { java.text.DecimalFormat format=new java.text.DecimalFormat("0000"); System.out.println(format.format(3)); System.out.println(format.format(500)); } } 运行看看效果先
import java.util.StringTokenizer;/** * @author 作者 E-mail: * @version 创建时间:Aug 11, 2009 5:18:59 PM * 类说明 */ public class Test {/** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Test t = new Test(); System.out.println(t.getStr()); } public String getStr(){ String str = ":0:1:2:23:245"; StringTokenizer st = new StringTokenizer(str,":"); String aa = new String(); while(st.hasMoreTokens()){ String a = st.nextToken(); int al = a.length(); int bl=0; if(al<4) bl = 4-al; StringBuffer c = new StringBuffer("0");
import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.StringTokenizer; /** * @author 作者 E-mail: * @version 创建时间:Aug 11, 2009 5:18:59 PM 类说明 */ public class Test { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Test t = new Test(); List li = t.getStr(); Iterator it = li.iterator(); while(it.hasNext()){ String str = (String)it.next(); System.out.println("str is:"+str); } } public List getStr(){ List list = new ArrayList(); String str = ":0:1:2:23:245"; StringTokenizer st = new StringTokenizer(str,":"); String aa = new String(); while(st.hasMoreTokens()){ String a = st.nextToken(); int al = a.length(); int bl=0; if(al <4) bl = 4-al; StringBuffer c = new StringBuffer("0"); if(c.length()!=bl){ c.append("0"); } aa=c.toString()+a; list.add(aa); } return list; } }
这个是准确的:你运行一下 import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.StringTokenizer;/** * @author 作者 E-mail: * @version 创建时间:Aug 11, 2009 5:18:59 PM 类说明 */ public class Test { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Test t = new Test(); List li = t.getStr(); Iterator it = li.iterator(); while (it.hasNext()) { String str = (String) it.next(); System.out.println("str is:" + str); } } public List getStr() { List list = new ArrayList(); String str = ":0:1:2:23:245"; StringTokenizer st = new StringTokenizer(str, ":"); String aa = new String(); while (st.hasMoreTokens()) { String a = st.nextToken(); int al = a.length(); int bl = 0; if (al < 4) bl = 4 - al; StringBuffer c = new StringBuffer("0"); for (int i = 0; i < bl; i++) { if (c.length() < bl) { c.append("0"); } if (c.length() == bl) { aa = c.toString() + a; list.add(aa); break; } } } return list; } }
import java.text.DecimalFormat; import java.text.NumberFormat;public class ACM { public static void main(String[] args) {
String s = "0:1:2:23:245.45";
String[] arr = s.split(":");
NumberFormat format = new DecimalFormat("0000"); StringBuffer sb = new StringBuffer();
赞成你的想法。 用split 判断位数 然后添0 在连接
{
public static void main(String args[])
{
java.text.DecimalFormat format=new java.text.DecimalFormat("0000");
System.out.println(format.format(3));
System.out.println(format.format(500));
}
}
运行看看效果先
* @author 作者 E-mail:
* @version 创建时间:Aug 11, 2009 5:18:59 PM
* 类说明
*/
public class Test {/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Test t = new Test();
System.out.println(t.getStr());
}
public String getStr(){
String str = ":0:1:2:23:245";
StringTokenizer st = new StringTokenizer(str,":");
String aa = new String();
while(st.hasMoreTokens()){
String a = st.nextToken();
int al = a.length();
int bl=0;
if(al<4)
bl = 4-al;
StringBuffer c = new StringBuffer("0");
if(c.length()!=bl){
c.append("o");
}
aa=c.toString()+a;
}
return aa;
}
for(int i=0;i<str.length;i++){
if(str[i].length()<4){
str[i]=addZero(4-str[i]length())+str[i];//addZero(int i)你可以自己写个方法
}
}String addZero(int number){
String st = "";
for(int i=0;i<number;i++){
st+="0";
}
return st;
}
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
/**
* @author 作者 E-mail:
* @version 创建时间:Aug 11, 2009 5:18:59 PM 类说明
*/
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Test t = new Test();
List li = t.getStr();
Iterator it = li.iterator();
while(it.hasNext()){
String str = (String)it.next();
System.out.println("str is:"+str);
}
}
public List getStr(){
List list = new ArrayList();
String str = ":0:1:2:23:245";
StringTokenizer st = new StringTokenizer(str,":");
String aa = new String();
while(st.hasMoreTokens()){
String a = st.nextToken();
int al = a.length();
int bl=0;
if(al <4)
bl = 4-al;
StringBuffer c = new StringBuffer("0"); if(c.length()!=bl){
c.append("0");
}
aa=c.toString()+a;
list.add(aa);
}
return list;
}
}
printf("%4s:",str); 我具体也没怎么研究,你可以试着写下
DecimalFormat format=new jDecimalFormat("0000");
String s=":0:1:2:23:245";
String ss[]=s.split(":");
for(int i=0;i<ss.length;i++){
int sss=0;
if(!ss[i].equals("")){
sss=Integer.parseInt(ss[i]);
}
System.out.println(format.format(sss));
}
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;/**
* @author 作者 E-mail:
* @version 创建时间:Aug 11, 2009 5:18:59 PM 类说明
*/
public class Test { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Test t = new Test();
List li = t.getStr();
Iterator it = li.iterator();
while (it.hasNext()) {
String str = (String) it.next();
System.out.println("str is:" + str);
}
} public List getStr() {
List list = new ArrayList();
String str = ":0:1:2:23:245";
StringTokenizer st = new StringTokenizer(str, ":");
String aa = new String();
while (st.hasMoreTokens()) {
String a = st.nextToken();
int al = a.length();
int bl = 0;
if (al < 4)
bl = 4 - al;
StringBuffer c = new StringBuffer("0");
for (int i = 0; i < bl; i++) {
if (c.length() < bl) {
c.append("0");
}
if (c.length() == bl) {
aa = c.toString() + a;
list.add(aa);
break;
}
}
}
return list;
}
}
import java.text.NumberFormat;public class ACM { public static void main(String[] args) {
String s = "0:1:2:23:245.45";
String[] arr = s.split(":");
NumberFormat format = new DecimalFormat("0000"); StringBuffer sb = new StringBuffer();
for(int i = 0; i < arr.length; i++) {
sb.append(format.format(Double.parseDouble(arr[i])));
if(i != arr.length - 1) {
sb.append(':');
}
}
System.out.println(sb.toString());
}
}
import java.text.DecimalFormat;
import java.text.NumberFormat; public class Test{ public static void main(String[] args) { String s = "0:1:2:23:245.45"; String[] strs = s.split(":"); NumberFormat format = new DecimalFormat("0000"); StringBuffer sb = new StringBuffer(); for(int i = 0; i < strs[code=Java].length; i++) { sb.append(format.format(Double.parseDouble(arr[i]))); if(i != strs.length - 1) {
sb.append(':');
}
} System.out.println(sb.toString());
} } [/code]