java字符串截取,该怎么解决

java字符串截取
各位
我想获取
284_300_16_331_34_363_379_395_ 字符串中最后一个数（395（也有可能是两位数））
用java怎么获取
字符串长度不定

谢了！！

[解决办法]
Java code
public static void main(String[] args) throws IOException {    String str="284_300_16_331_34_363_379_395";    String temp;    if("_".equals(str.substring(str.length()-1,str.length()))){        temp=str.substring(0,str.lastIndexOf("_"));    }else{        temp=str;    }    System.out.println(temp.substring(temp.lastIndexOf("_")+1,temp.length()));}
[解决办法]
探讨

Java code

String s = "284_300_16_331_34_363_379_395_";
String[] ss= s.split("_");
System.out.println(ss[ss.length - 1]);

[解决办法]
String s = "284_300_16_331_34_363_379_39_";
String[] ss= s.split("_");
System.out.println(ss[ss.length - 1]);
[解决办法]
呃。。。lz说这个字符串长度不固定，也就是说如果很长的话用“_”分割会产生一个长度很长的数组。这样会不会太占用资源。如果这样实现的话 大家看有没有什么问题:
Pattern pattern = Pattern.compile("[0-9]*$");
Matcher matcher = pattern.matcher("234_1231_234_34_34_345_45_34");\
if(matcher.find())
   System.out.println(matcher.group());
[解决办法]
探讨

Java code

String s = "284_300_16_331_34_363_379_395_";
String[] ss= s.split("_");
System.out.println(ss[ss.length - 1]);

[解决办法]
Java code        String s ="284_300_16_331_34_363_379_395_";    String s1=s;    if(s.lastIndexOf("_")==s.length()-1){        s1 =s.substring(0,s.length()-1);    }    String last =s1.substring(s1.lastIndexOf("_")+1);    System.out.println(last);
[解决办法]
Java code  String _s = "284_300_16_331_34_363_379_395_";  String _s0 = _s.substring(0, _s.length-1);  int _last_index = _s0.lastIndexOf("_");  String _result = _s0.substring(_last_index+1);
[解决办法]
Pattern pattern = Pattern.compile("[0-9]{2,3}$");
Matcher matcher = pattern.matcher("234_1231_234_34_34_345_45_34");
if(matcher.find())
 System.out.println(matcher.group());
[解决办法]
String str="284_300_16_331_34_363_379_395_";
String[] s=str.split("_");
System.out.println(s[s.length-1]);
[解决办法]
Java code//这是楼上各位的，都很强大import java.util.regex.Matcher;import java.util.regex.Pattern;public class Split5 {    public static void main(String args[]) {        String s2 = "284_300_16_331_34_363_379_395_";        String[] ss = s2.split("_");        System.out.println(ss[ss.length - 1]);        //        String str = "284_300_16_331_34_363_379_395";        String temp;        if ("_".equals(str.substring(str.length() - 1, str.length()))) {            temp = str.substring(0, str.lastIndexOf("_"));        } else {            temp = str;        }        System.out.println(temp.substring(temp.lastIndexOf("_") + 1, temp                .length()));                //        String s ="284_300_16_331_34_363_379_395_";        String s1=s;        if(s.lastIndexOf("_")==s.length()-1){            s1 =s.substring(0,s.length()-1);        }        String last =s1.substring(s1.lastIndexOf("_")+1);        System.out.println(last);                //        String sq = "284_300_16_331_34_363_379_395_";        String _s0 = sq.substring(0, sq.length()-1);        int _last_index = _s0.lastIndexOf("_");        String _result = _s0.substring(_last_index+1);        System.out.println(_result);        //        Pattern pattern = Pattern.compile("[0-9]{2,3}$");        Matcher matcher = pattern.matcher("234_1231_234_34_34_345_45_34");        if(matcher.find())          System.out.println(matcher.group());    }} 
 
[解决办法]
public class SplitString {

public static void main(String[] args) {
String s = "284_300_16_331_34_363_379_39s5_";
String[] ss= s.split("_");
System.out.println(ss[ss.length - 1]);
}
}
[解决办法]
public class SplitString {

public static void main(String[] args) {
String s = "284_300_16_331_34_363_379_39s5_";
String[] ss= s.split("_");
System.out.println(ss[ss.length - 1]);
}
}
[解决办法]
[code=Java][/code]public static void main(String [] args){

String str="284_300_16_331_34_363_379_395_";
cutOut(str);
cutOut2(str);
cutOut3(str);

}
/**
 * 方法一
 * @param str
 */
private static void cutOut(String str) {
String [] arr=str.split("_");
int i=0;
for (String s : arr) {
System.out.println(i+": "+s);
i++;
}
System.out.println(arr[arr.length-1]);
}
/**
 * 方法二
 * @param str
 */
private static void cutOut2(String str) {
String s=str;
//判断最后一个是 _
int index=s.lastIndexOf("_");
if(index==str.length()-1){
s=s.substring(0,index);
}
System.out.println(s);
System.out.println("方法二："+(s.substring(s.lastIndexOf("_")+1,s.length())));
}
/**
 * 方法三
 * @param str
 */
private static void cutOut3(String str){
Pattern pattern=Pattern.compile("([0-9]{2,3})");
Matcher matcher=pattern.matcher(str);
while(matcher.find()){
System.out.println(matcher.group());
}
}

建议使用方法二
[解决办法]
Java code    public static void main(String [] args){        String str="284_300_16_331_34_363_379_395_";        cutOut(str);        cutOut2(str);        cutOut3(str);            }    /**     * 方法一     * @param str     */    private static void cutOut(String str) {        String [] arr=str.split("_");        System.out.println(arr[arr.length-1]);    }    /**     * 方法二     * @param str     */    private static void cutOut2(String str) {        String s=str;        //判断最后一个是 _        int index=s.lastIndexOf("_");        if(index==str.length()-1){            s=s.substring(0,index);        }        System.out.println(s);        System.out.println("方法二："+(s.substring(s.lastIndexOf("_")+1,s.length())));    }    /**     * 方法三     * @param str     */    private static void cutOut3(String str){                Pattern pattern=Pattern.compile("^(.*_)(\\d+)(_?)$");        Matcher matcher=pattern.matcher(str);        if(matcher.matches()){            System.out.println(matcher.group(2));        }        else        {            System.out.println("Not match!");        }    }
[解决办法]
Java codepublic class Test {    public static void main(String[] args) {        String s = "284_300_16_331_34_363_379_395_";        String[] str = s.split("_");        System.out.println(str[str.length-1]);    }}
[解决办法]
探讨

Java code

String s = "284_300_16_331_34_363_379_395_";
String[] ss= s.split("_");
System.out.println(ss[ss.length - 1]);

 
 [解决办法]
探讨
Java code

    public static void main(String [] args){
        String str="284_300_16_331_34_363_379_395_";
        cutOut(str);
        cutOut2(str);
        cutOut3(str);
        
    }
  ……
java字符串 截取,该怎么解决

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