使用 for 循环检查数组

Question

I'm trying to use a for loop to examine each character in an array and print the character, it's position in the array, and what type of character it is (vowel, consonant, etc.). I have this so far:

char[] myName = new char[] {'J', 'o', 'h', 'n', ' ', 'D', 'o', 'e'};

         System.out.print("\nMy name is: ");

            for(int index=0; index < myName.length ; index++)
            System.out.print(myName[index]);

            for(char c : myName) {
            if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')
            {
                System.out.println("The character located at position is a vowel.");
            }
            else if (c == 'j' || c == 'h' || c == 'n' || c == 'd')
            {
                System.out.println("The character located at position is a consonant.");
            }
            else if (c == ' ')
            {
                System.out.println("The character located at position is a space.");
            }

How do I print the location of the character (ie "The character x located at position x is a vowel.")

Answer 1

You're on the right track. Your loop is OK, but try the foreach syntax if you don't actually need the index, like this:

 char[] myName = new char[] {'J', 'o', 'h', 'n', ' ', 'D', 'o', 'e'};

 System.out.print("\nMy name is: ");

 for(char c : myName) {
     System.out.print(c); 
 }

Now add in some logic:

 int i = 0;
 for(char c : myName) {
     i++;
     // Is the char a vowel?
     if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u') {
         // do something - eg print in uppercase
         System.out.print(Character.toUpperCase(c) + " at position " + i);
     } else {
         // do something else - eg print in lowercase
         System.out.print(Character.toLowerCase(c) + " at position " + i);
     }
 }

You must figure out what you want to do here. Now go do it:)

EDITED: To show use of position, which is a little clumsy, but still less code than a standard for loop

Answer 2

Hints:

• You should use the kind of for loop that you are currently using. The value index variable is going to be useful in your output.

• The Character class has a number of methods for classifying characters, and for converting from upper case to lower case & vice versa.

• You can also use == to test characters...

• You could also use a switch statement to discriminate between the different kinds of letter, and use the default branch for the rest.

Answer 3

     char[] myName = new char[] {'J', 'o', 'h', 'n', ' ', 'D', 'o', 'e'};

     System.out.print("\nMy name is: ");

        for(int index=0; index < myName.length ; index++)
        char c = myname[index];
        if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')
        {
            System.out.println("The character " + c + "located at position " + index + " is a vowel.");
        }
    ... }