Version verification

 

Version verification

import java.util.Arrays;

public class VersionCompareUtil {
	
	
	public static int compare(String currentVersion ,String appVersion){
		String[] currentVersionArr = currentVersion.split("\\.");
		String[] appVerisonArr = appVersion.split("\\.");
		int result = 0;
		for (int i = 0; i < currentVersionArr.length; i++) {
			if(Integer.valueOf(appVerisonArr[i]) > Integer.valueOf(currentVersionArr[i])){
			  result += (1 << (3*(2-i)+2)) ;	
			}else if(Integer.valueOf(appVerisonArr[i]) == Integer.valueOf(currentVersionArr[i])){
				 result += (1 << (3*(2-i) +1));
			}else {
				result += (1 << 3*(2-i)) ;
			}
		}  
		if(result > 146)
			return 1;
		else if (result == 146)
            return 0;
		return -1;
	}
	
	public static void main(String[] args) {
	  System.out.println("3.0.32  3.0.33 ====" + compare("3.0.32", "3.0.33"));
	  System.out.println("3.0.32  3.0.31 ====" + compare("3.0.32", "3.0.31"));
	  System.out.println("3.0.32  3.0.32 ====" + compare("3.0.32", "3.0.32"));
	  System.out.println("3.1.32  3.0.32 ====" + compare("3.1.32", "3.0.32"));
	  System.out.println("2.1.32  3.0.32 ====" + compare("2.1.32", "3.0.32"));
	}
  
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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