手机应用版本比较（Java&Ruby)

###手机应用应用版本比较（Java）###

/** * 版本比较 * @param version1 * @param version2 * @return * -1: version1小于version2 * 1: version1大于version2 * 0: version1等于version2 */ public static int versionCompare(String version1, String version2) { String[] arr1 = version1.split("\."), arr2 = version2 .split("\.");

	int maxLen = Math.max(arr1.length, arr2.length);
	int result=0;

	for (int i = 0; i < maxLen; i++) {
		int i1=0, i2=0;
		char[] c1 = null, c2 = null;
		if (arr1.length > i) {
			if (NumberUtils.isDigits(arr1[i])) {
				i1 = NumberUtils.toInt(arr1[i]);
			} else {
				c1 = arr1[i].toCharArray();
				i1 = Integer.parseInt(c1[0]+"");
			}
		} else {
			i1 = Integer.MIN_VALUE;
		}
		if (arr2.length > i) {
			if (NumberUtils.isDigits(arr2[i])) {
				i2 = NumberUtils.toInt(arr2[i]);
			} else {
				c2 = arr2[i].toCharArray();
				i2 = Integer.parseInt(c2[0]+"");
			}
		} else {
			i2 = Integer.MIN_VALUE;
		}
		
		if (i1 > i2) {
			result = 1;
		} else if (i1 < i2) {
			result = -1;
		} else {
			if (c1 != null && c2 != null) {
				int c12lenmin = c1.length < c2.length ? c1.length : c2.length;
				for (int j = 0; j < c12lenmin; j++) {
					if (c1[j]>c2[j]) {
						result = 1;
					} else if (c1[j] < c2[j]) {
						result = -1;
					} else {
						result = 0;
					}
					if (result != 0) {
						break;
					} else {
						if (c1.length > c2.length) {
							result = 1;
						} else if (c1.length < c2.length) {
							result = -1;
						}
					}
				}
			}
			if (c1 == null && c2 !=null) {
				if (i1 > (c2[0]-48)) {
					result = 1;
				} else if (i1 < (c2[0]-48)){
					result = -1;
				} else {
					if (c2.length>1) {
						result = 1;
					} else {
						result = 0;
					}
				}
			}
			if (c2 == null && c1 !=null) {
				if ((c1[0]-48) > i2) {
					result = 1;
				} else if ((c1[0]-48) < i2){
					result = 1;
				} else {
					if (c1.length>1) {
						result = -1;
					} else {
						result = 0;
					}
				}
			}
		}
		if (result != 0) {
			break;
		}
	}

	return result;
}

测试代码

int result = versionCompare("3.0.5beta", "3.0.4");
System.out.println(result);

能够正确得出结果1

算法很繁杂，如果有更好的，请回复。

###手机应用应用版本比较（Ruby）###

-1:version1小于version2;1:version1大于version2;0:version1等于version2

def versionCompare version1,version2
strArr1 = version1.split('.')
strArr2 = version2.split('.')
maxLen = strArr1.length > strArr2.length ? strArr1.length : strArr2.length
result = 0
for i in 0..maxLen
  begin
    sa = strArr1[i].to_i
  rescue
    sa = 0
  end
  begin
    sb = strArr2[i].to_i
  rescue
    sa = 0
  end
  if sa > sb
    result = 1
  elsif sa < sb
    result = -1
  else
    result = 0
  end
  if result != 0
    break;
  end
end 
return result
end

测试

versionCompare('3.0.5beta', '3.0.5')

能够正确得出1