INTRODUCTION TO JAVA PROGRAMMING教学（华南理工）TEST8.docVIP

1 Suppose s is a string with the value java. What will be assigned to x if you execute the following code?char x = s.charAt(4); A. a B. v C. Nothing will be assigned to x, because the execution causes the runtime error StringIndexOutofBoundsException. C 2 Which of the following statements is preferred to create a string Welcome to Java? A. String s = Welcome to Java; B. String s = new String(Welcome to Java); C. String s; s = Welcome to Java; D. String s; s = new String(Welcome to Java); A3 What is the output of the following code?public class Test { ??public static void main(String[] args) {????String s1 = Welcome to Java!;????String s2 = s1;????if (s1 == s2)??????System.out.println(s1 and s2 reference to the same String object);????else??????System.out.println(s1 and s2 reference to different String objects);??}} A. s1 and s2 reference to the same String object B. s1 and s2 reference to different String objects A 4 What is the output of the following code?public class Test { ??public static void main(String[] args) {????String s1 = Welcome to Java!;????String s2 = Welcome to Java!;????if (s1 == s2)??????System.out.println(s1 and s2 reference to the same String object);????else??????System.out.println(s1 and s2 reference to different String objects);??}} A. s1 and s2 reference to the same String object B. s1 and s2 reference to different String objects A 5 What is the output of the following code?public class Test { ??public static void main(String[] args) {????String s1 = new String(Welcome to Java!);????String s2 = new String(Welcome to Java!);????if (s1 == s2)??????System.out.println(s1 and s2 reference to the same String object);????else??????System.out.println(s1 and s2 reference to different String objects);??}} A. s1 and s2 reference to the same String object B. s1 and s2 reference to different String objects B 6 Suppose s1 and s2 are two strings. What is the result of ????s1.equals(s2) == s2.equals(s1) A. true B. fal