import java.util.Arrays;

/**
 * Created by IntelliJ IDEA.
 * User: Administrator
 * Date: 2011-9-30
 * Time: 13:25:53
 * To change this template use File | Settings | File Templates.
 */
public class StringHandler {
    public static String[] splitYourStr(String str){
         String[] yourWant=new String[4];
        String connect="_";
        int a=str.indexOf(connect);
        int b=str.indexOf(connect,a+1);
        int c=str.indexOf(connect,b+1);

        yourWant[0]=str.substring(0,a);
        yourWant[1]=str.substring(a+1,b);
        yourWant[2]=str.substring(b+1,c);
        yourWant[3]=str.substring(c+1);

        System.out.println(Arrays.toString(yourWant));
        return yourWant;
    }
    public static void main(String[] args){
        String str="AND_ThalassemiaGeneTest_TGTAlphaBehind__3.7α";
//        String str="AND_ThalassemiaGeneTest_TGTAlphaBehind__ _SEA";
        String[] r=splitYourStr(str);
        System.out.println(Arrays.toString(r));


    }
}

------解决方案--------------------
楼主你看这样怎么样
String str="AND_ThalassemiaGeneTest_TGTAlphaBehind_BJFKD";
String s1=str.substring(0,str.lastIndexOf("_")); 
String s2=str.substring(str.lastIndexOf("_")+1,str.length());
String[] arr=s1.split("_");
arr=Arrays.copyOf(arr,arr.length+1);
arr[arr.length]=s2;
for(String s:arr){
  System.out.println(s);
}

------解决方案--------------------
还是写一个吧，不管对你是否有用
Java code

 
    static String[] getResult(String src){
    String[] result = new String[4];
    int pre = 0;
    for(int i=0; i<3; i++){
        int index = src.indexOf("_",pre);       
        result[i] = src.substring(pre,index);
        pre = index+1;
    }
    result[3] = src.substring(pre);         
    return result;
    }