Review Questions

What will be the result of attempting to compile and run the following program?

public class MyClass {
    public static void main(String[] args) {
        String s = "hello";
        StringBuffer sb = new StringBuffer(s);
        sb.reverse();
        if (s == sb) System.out.println("a");
        if (s.equals(sb)) System.out.println("b");
        if (sb.equals(s)) System.out.println("c");
    }
}

Select the one correct answer.

What will be the result of attempting to compile and run the following program?

public class MyClass {
    public static void main(String[] args) {
        StringBuffer sb = new StringBuffer("have a nice day");
        sb.setLength(6);
        System.out.println(sb);
    }
}

Select the one correct answer.

Which of these parameter lists have a corresponding constructor in the StringBuffer class?

Select the three correct answers.

Which method is not defined in the StringBuffer class?

Select the one correct answer.

What will be the result of attempting to compile and run the following code?

public class StringMethods {
    public static void main(String[] args) {
        String str = new String("eenny");
        str.concat(" meeny");
        StringBuffer strBuf = new StringBuffer(" miny");
        strBuf.append(" mo");
        System.out.println(str + strBuf);
    }
}

Select the one correct answer.