版本号比较versionCompare

/**
* 版本号比较versionCompare方法,java实现
* if v1 > v2 , return 1;
* if v1 < v2 , return 2;
* if equal , return 0;
* input error ,return -1;
*/

public class Test {

public static void main(String[] versions) {
int result1 = versionCompare("0.1.5", "0.1.5");
System.out.print("resultCode1:" + result1);

int result2 = versionCompare("0.2.5", "0.1.5");
System.out.print("resultCode1:" + result2);

int result3 = versionCompare("0.1.4", "0.1.5");
System.out.print("resultCode1:" + result3);

int result4 = versionCompare("0.1.5c测试", "0.1.5");
System.out.print("resultCode1:" + result4);


}

public static int versionCompare(String v1, String v2) {

Pattern pattern = Pattern.compile("\\d+(\\.\\d+)*");
if (!pattern.matcher(v1).matches() || !pattern.matcher(v2).matches()) {
return -1;
}
String[] str1 = v1.split("\\.");
String[] str2 = v2.split("\\.");

int length = str1.length < str2.length ? str1.length : str2.length;
for (int i = 0; i < length; i++) {
int diff = Integer.valueOf(str1[i]) - Integer.valueOf(str2[i]);
if (diff == 0) {
continue;
} else {
return diff > 0 ? 1 : 2;
}
}
return 0;
}
}
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