添加字符以获得ASCII值的目的是什么?

测试时(使用以下代码) char 'a' 是 10 ,以及的ASCII值 char 'b' 是 11 。 然而 ,连接时 字符“a” 和 字符'b' ,结果是 195 。

我在这里的逻辑和/或理解肯定有错误。。。我 做 理解字符不能连接为字符串,但是 195 然后代表?

这样的结果有什么用?

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这是我的代码:

public class Concatenated
{
    public static void main(String[] args)
    {
        char char1 = 'a';
        char char2 = 'b';

        String str1 = "abc";

        String result = "";
        int intResult = 0;
        Concatenated obj = new Concatenated();

        // calling methods here
        intResult = obj.getASCII(char1);
        System.out.println("The ASCII value of char \"" + char1 + "\" is: " + intResult + ".");

        intResult = obj.getASCII(char2);
        System.out.println("The ASCII value of char \"" + char2 + "\" is: " + intResult + ".");

        result = obj.concatChars(char1, char2);
        System.out.println(char1 + " + " + char2 + " = " + result + ".");

        result = obj.concatCharString(char1, str1);
        System.out.println("The char \"" + char1 + "\" + the String \"" + str1 + "\" = " + result + ".");
    } // end of main method

    public int getASCII(char testChar)
    {
        int ans = Character.getNumericValue(testChar);

        return ans;
    } // end of method getASCII

    public String concatChars(char firstChar, char secondChar)
    {
        String ans = "";
        ans += firstChar + secondChar; // "+=" is executed last

        return ans; // returns ASCII value
    } // end of method concatChars

    public String concatCharString(char firstChar, String str)
    {
        String ans = "";
        ans += firstChar + str;

        return ans;
    } // end of method concatCharString
} // end of class Concatenated

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…打印到屏幕上的结果如下:

The ASCII value of char "a" is: 10.
The ASCII value of char "b" is: 11.
a + b = 195.
The char "a" + the String "abc" = aabc.

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--编辑:--

正如@Marko Topolnik在下面指出的那样 getASCII 应更改为该值以返回正确的ASCII值(以及 不 UNICODE值):

public int getASCII(char testChar)
{
    // int ans = Character.getNumericValue(testChar); ...returns a UNICODE value!
    int ans = testChar;

    return ans;
} // end of method getASCII

为了子孙后代,我没有改变上面的代码来反映这一点。