在java里怎样把一个反斜杠“\”转换成两个反斜杠“\\”

[rongcolt]

哥们看看这样为什么不行呀
public class test {
public test() {
String dd="C:\\dada\\d.exe";
System.out.println(dd.replaceAll("\\","\\\\"));
}
public static void main(String a[]){
new test();
}
}

[54sunboy]

"\\\" ==>"\"

[tom2005]

System.out.println(dd.replaceAll("\\\\","\\\\\\\\"));
这样试一下

[Ennis_wan]

System.out.println(dd.replaceAll("\\\\","\\\\\\\\"));

[frhwxx]

public class test {
public test() {
String dd="C:\\dada\\d.exe";
System.out.println(dd.replaceAll("\\\\","\\\\\\\\"));
}
public static void main(String args[]){
new test();
}
}

------------------------------------------------------------

Result:

C:\\dada\\d.exe

[rongcolt]

谢谢各位大侠!敬礼!

[coolice_2004]

dd.replaceAll("\\\\","\\\\\\\\");

[wpx80]

replaceAll用的是BNF的写法，要彻底理解要看一下规则表达式的写法,\\\\其实才一个\

[深圳万兴]

replaceAll("\\\\","\\\\\\\\");

[wandou999]

replaceAll("\\\\","\\\\\\\\");

[HITZXL]

replaceAll("\\","\\\\\\\\");

[classjava]

用函数replaceAll("\\","\");

[chenyongchina]

这里有另一个方法：你可以看看，
package dd;
import java.util.StringTokenizer;
import java.util.*;
public class separate {
String path;
String ss = "";
StringTokenizer tokenizer;
private final String delim1 = "\\"; // 包含分号、逗号、句点、竖址分隔符
public separate() {
}
Vector v = new Vector();
Vector v1 =new Vector();
public Vector test1() {
try{
String path = "d::\\dada\\d.exe"
ss = "";
tokenizer = new StringTokenizer(path, delim1);
while (tokenizer.hasMoreTokens()) {
String mm= tokenizer.nextToken();
v.add(mm);
}
for(int i = 0; i < v.size(); i ++)
{
ss+= (String)v.elementAt(i) + "\\\\";
}
v1.add(ss);
System.out.println(ss);
}
conn.closeConn();
}catch(Exception e){
}
return v1;
}
public final static void main(String[] args) {
separate demo = new separate ();
demo.test1();
}
}