Line 13
Line 14
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第1题:
public class Test { public static void main(String [] args) { boolean assert = true; if(assert) { System.out.println(”assert is true”); } } } Given: javac -source 1.3 Test.java What is the result?()
第2题:
public class Test { public static void main (String args) { string foo = “blue”; string bar = foo; foo = “green”; System.out.printIn(bar); } } What is the result?()
第3题:
下列关于Test类的定义中,正确的是______。
A) class Test implements Runnabte{
public void run(){}
public void someMethod(){}
B) class Test implements Rnuuable{
public void run();
}
C) class Test implements Rnuuable{
public void someMethod();
}
D) class Test implements Rnuuable{
public void someMethod();{}
}
A.
B.
C.
D.
第4题:
public class Test{ public static void main( String[] argv ){ // insert statement here } } Which statement, inserted at line 3, produces the following output?() Exception in thread “main” java.lang.AssertionError: true at Test.main(Test.java:3)
第5题:
11. public class Test { 12. public void foo() { 13. assert false; 14. assert false; 15. } 16. public void bar(){ 17. while(true){ 18. assert false; 19. } 20. assert false; 21. } 22. } What causes compilation to fail?()
第6题:
11. public void addStrings(List list) { 12. list.add(”foo”); 13. list.add(”bar”); 14. } What must you change in this method to compile without warnings?()
第7题:
class One { public One foo() { return this; } } class Two extends One { public One foo() { return this; } } class Three extends Two { // insert method here } Which two methods, inserted individually, correctly complete the Three class?()
第8题:
10. public class ClassA { 11. public void count(int i) { 12. count(++i); 13. } 14. } And: 20. ClassA a = new ClassA(); 21. a.count(3); Which exception or error should be thrown by the virtual machine?()
第9题:
public class Test { public static void main(String args[]) { class Foo { public int i = 3; } Object o = (Object)new Foo(); Foo foo = (Foo)o; System.out.println(“i = “ + foo.i); } } What is the result?()
第10题:
public class Test {} What is the prototype of the default constructor?()