Michael Drum :
I know that I could do this with a series of for loops that iterate through the string but that would be terrible programming. Well, my professor prefers I don't do it this way. I'd like to use regular expressions to do this.
CyprUS :
For a simple string check, a single sweep through the string is enough. Since Regex will not offer any significant benefit, here is a simple for loop to achieve the same :
private static boolean checkString(String str) {
char ch;
boolean capitalFlag = false;
boolean lowerCaseFlag = false;
boolean numberFlag = false;
for(int i=0;i < str.length();i++) {
ch = str.charAt(i);
if( Character.isDigit(ch)) {
numberFlag = true;
}
else if (Character.isUpperCase(ch)) {
capitalFlag = true;
} else if (Character.isLowerCase(ch)) {
lowerCaseFlag = true;
}
if(numberFlag && capitalFlag && lowerCaseFlag)
return true;
}
return false;
}
Test run:
System.out.println(checkString("aBCd1")); // output is true
System.out.println(checkString("abcd")); //output is false
I think this should help OP's particular problem.
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