JAVA题库:格林模拟试题三（下）(4)

question 41)

you are creating an application that has a form with a text entry field used to enter a persons age. which of the following is appropriate for capturing this information.

1) use the text field of a textfield and parse the result using integer
2) use the getinteger method of the textfield
3) use the gettext method of a textbox and parse the result using the getint method of integer class
4) use the gettext method of a textfield and use the parseint method of the integer class

question 42)

given the following declaration

integer i=new integer(99);

how can you now set the value of i to 10?

1) i=10;
2) i.setvalue(10);
3) i.parseint(10);
4) none of the above

question 43)

which of the following statements are true

1) constructors cannot be overloaded
2) constructors cannot be overridden
3) a constructor can return a primitive or an object reference
4) constructor code executes from the current class up the hierarchy to the ancestor class

question 44)

given a reference called

t

to a class which extends thread, which of the following will cause it to give up cycles to allow another thread to execute.

1) t.yield();
2) thread.yield();
3) yield(100); //or some other suitable amount in milliseconds
4) yield(t);