单项选择题
class Foo {
private int x;
publicFoo(intx) {this.x=x; }
public void setX( int x) { this.x = x; }
public int getX() { return x; }
}
public class Gamma {
static Foo fooBar( Foo foo) {
foo = new Foo( 100);
return foo;
}
public static void main( String[] args) {
Foo foo = new Foo( 300);
System.out.print( foo.getX() + “-“);
Foo fooFoo = fooBar( foo);
System.out.print( foo.getX() + “-“);
System.out.print( fooFoo.getX() + “-“);
foo = fooBar( fooFoo);
System.out.print( foo.getX() + “-“);
System.out.prmt( fooFoo.getX());
}
}
What is the output of this program?()
A. 300-100-100-100-100
B. 300-300-100-100-100
C. 300-300-300-100-100
D. 300-300-300-300-100
相关考题
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多项选择题
10. class Inner { 11. private int x; 12. public void setX( int x) { this.x = x; } 13. public int getX() { return x; } 14. } 15. 16. class Outer { 17. private Inner y; 18. public void setY( Inner y) { this.y = y; } 19. public Inner getY() { return y; } 20. } 21. 22. public class Gamma { 23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner(); 26.int n=10; 27. i.setX(n); 28. o.setY(i); 29. // insert code here 30. System.out.println( o.getY().getX()); 31. } 32. } Which three code fragments, added individually at line 29, produce the output 100?()
A. n = 100;
B. i.setX( 100);
C. o.getY().setX( 100);
D. i = new Inner(); i.setX( 100);
E. o.setY( i); i = new Inner(); i.setX( 100);
F. i = new Inner(); i.setX( 100); o.setY( i); -
单项选择题
public class ItemTest { private final mt id; public ItemTest(int id) { this.id = id; } public void updateId(int newId) { id = newId; } public static void main(String[] args) { ItemTest fa = new ItemTest(42); fa.updateId(69); System.out.println(fa.id); } } What is the result?()
A. Compilation fails.
B. An exception is thrown at runtime.
C. The attribute id in the Item object remains unchanged.
D. The attribute id in the Item object is modified to the new value.
E. A new Item object is created with the preferred value in the id attribute. -
单项选择题
public class Item { private String desc; public String getDescription() { return desc; } public void setDescription(String d) { desc = d; } public static void modifyDesc(Item item, String desc) { item = new Item(); item.setDescription(desc); } public static void main(String[] args) { Item it = new Item(); it.setDescription(”Gobstopper”); Item it2 = new Item(); it2.setDescription(”Fizzylifting”); modifyDesc(it, “Scrumdiddlyumptious”); System.out.println(it.getDescription()); System.out.println(it2.getDescription()); } } What is the outcome of the code? ()
A. Compilation fails.
B. Gobstopper Fizzylifting
C. Gobstopper Scrumdiddlyumptious
D. Scrumdiddlyumptious Fizzylifltng
E. Scrumdiddlyumptious Scrumdiddlyumptious
