We need to write the function to check the password entered is correct or based on the following conditions..

-
a) It must have atleast one lower case character and one digit.
b)It must not have any Upper case characters
c) length should be b/w 5-12.
d) It should not have any same immediate patterns like
abcanan1 : not acceptable coz of an an pattern
abc11se: not acceptable, coz of pattern 11
123sd123 : acceptable, as not immediate pattern
adfasdsdf : not acceptable, as no digits
Aasdfasd12: not acceptable, as have uppercase character

Solution :

package assignment1;

import java.util.Scanner;

/**
 * @author Snlkjha
 */
public class ValidPassword {
 
/*It must have atleast one lower case character*/  
public static boolean islower(String password){
    char pass[]=password.toCharArray();
    for(int i=0;i<pass.length;i++)
        if((int)pass[i]>=97 &&(int)pass[i]<=122) return true;
 
    return false;
}

/*It must not have any Upper case characters*/
public static boolean isupper(String password){  
    char pass[]=password.toCharArray();
    for(int i=0;i<pass.length;i++)
        if((int)pass[i]>=65 &&(int)pass[i]<=90) return false;
 
    return true;
}

/*It must have atleast one digit*/
public static boolean isdigit(String password){  
    char pass[]=password.toCharArray();
    for(int i=0;i<pass.length;i++)
        if(pass[i]-'0'>=0 && pass[i]-'0'<=9) return true;
 
    return false;
    }

/*length should be b/w 5-12*/
public static boolean length(String password){  
    char pass[]=password.toCharArray();
    int count=0;
    for(char c:pass) count++;
    return (count>=5 && count<=12);
    }

/*
 *It should not have any same immediate patterns like
 * abcanan1 : not acceptable coz of an an pattern
 * abc11se: not acceptable, coz of pattern 11
 * 123sd123 : acceptable, as not immediate pattern
 */
public static boolean pattern(String password){  
    char pass[]=password.toCharArray();
    int k=0;
    for(int i=1;i<pass.length;i++){
        if(pass[k]==pass[i]){
            int count=1;
            int t1=k;           /*Initial index of each char*/
            int t2=i;            /*Next index of same char*/
            while(++i<pass.length && pass[i]==pass[++k]) count++;
            if(t1+count==t2) return false;
            else{   k=t1+1;i=k; }          
        }else if(i==pass.length-1){ k++;i=k;    }  
    }
    return true;
    }

public static void isValidPassword(String password){
    String err_msg="";
    if(islower(password)==false) err_msg+="Password must have atleast one lower case characters.\n";
    if(isupper(password)==false) err_msg+="Password must not have any Upper case characters.\n";
    if(pattern(password)==false) err_msg+="Password should not have any same immediate patterns.\n";
    if(length(password)==false) err_msg+="Password length should be b/w 5-12.\n";  
    if(isdigit(password)==false) err_msg+="Password must have atleast one digit.\n";
    boolean result=islower(password) && isupper(password) && pattern(password) && length(password) && isdigit(password);
    if(result==true) System.out.println("Password is Valid.");
    else System.out.println(err_msg);
}

public static void main(String[] args){
    String password;
    Scanner sc=new Scanner(System.in);
    System.out.print("Enter Password :");
    password=sc.nextLine();
    isValidPassword(password);
    }

}

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