多项选择题
Given the following code, which code fragments, when inserted at the indicated location, will succeed in making the program display a button spanning the whole window area?() import java.awt.*; public class Q1e65 { public static void main(String args[]) { Window win = new Frame(); Button but = new Button("button"); // insert code fragment here win.setSize(200, 200); win.setVisible(true); } }
单项选择题
public class Test { public enum Dogs {collie, harrier}; public static void main(String [] args) { Dogs myDog = Dogs.collie; switch (myDog) { case collie: System.out.print(”collie “); case harrier: System.out.print(”harrier “); } } } What is the result?()
String a = “ABCD”; String b = a.toLowerCase(); b.replace(‘a’, ‘d’); b.replace(‘b’, ‘c’); System.out.println(b); What is the result? ()
1. interface foo { 2. int k = 0; 3. } 4. 5. public class test implements Foo ( 6. public static void main(String args[]) ( 7. int i; 8. Test test = new test (); 9. i= test.k; 10.i= Test.k; 11.i= Foo.k; 12.) 13.) 14. What is the result?()
11. class Snoochy { 12. Boochybooch; 13. public Snoochy() { booch = new Boochy(this); } 14. } 15. 16. class Boochy { 17. Snoochy snooch; 18. public Boochy(Snoochy s) { snooch = s; } 19. } And the statements: 21. public static void main(String[] args) { 22. Snoochy snoog = new Snoochy(); 23. snoog = null; 24. // more code here 25. } Which statement is true about the objects referenced by snoog, snooch, and booch immediately after line 23 executes?()
What is the result?()
1. public class A { 2. public void doit() { 3. } 4. public String doit() { 5. return “a”; 6. } 7. public double doit(int x) { 8. return 1.0; 9. } 10.} What is the result?()
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