java中的简单字符串连接操作

Question

I want to get the following output:

Hello Steve Andrews!

These are my variables:

a = "steve";
b = "Andrew"

I tried this:

System.out.print("Hello " + a + " " + b + "s");

I don't know where to put .toUpper() for steve . The s should be in uppercase. How do I do this?

Answer 1

Use StringUtils.capitalize(a) ,

"Hello " + StringUtils.capitalize(a) + " " + b + "s"

Capitalizes a String changing the first letter to title case as per Character.toTitleCase(char). No other letters are changed.

Answer 2

You could use StringUtils.capitalize(str) , or if you want to do it by yourself:

public static String capitalize(String str) {
    int strLen;
    if (str == null || (strLen = str.length()) == 0) {
        return str;
    }
    return new StringBuffer(strLen)
        .append(Character.toTitleCase(str.charAt(0)))
        .append(str.substring(1))
        .toString();
}

Answer 3

You could also try using this method:

 public static String capitalize(String str) { str = (char) (str.charAt(0) - 32) + str.substring(1); return str; } 

Though it should be noted that this method assumes that the first character in str is indeed a lowercase letter.

Answer 4

Finally, I tried to do it without stringutils.. But anyways, thanks to all who helped :)

public class Hello
    {
      public static void main(String[] args){
        String a = "steve";
        String b = "Andrew";
        String firstletter = a.substring(0,1);
        String remainder = a.substring(1);
        String capitalized = firstletter.toUpperCase() + remainder.toLowerCase();

        System.out.print("Hello " + capitalized + " " + b + "s" );

    }
}