JAVA CONCEPTS

Important Java Mcq 1

Which of the following are true about flowlayout?

a. The default layout manager for an Applet is FlowLayout

b. The default layout manager for an application is FlowLayout

c. A layout manager must be assigned to an Applet before the setSize method is called

d. The FlowLayout manager attempts to honor the preferred size of any components

Answer:

a. The default layout manager for an Applet is FlowLayout.

Explanation:

For Panels, including Applets, the default layout manager belongs to the class FlowLayout. For Windows, the default layout manager is a borderLayout. You can change thelayout manager of a container using its setLayout(LayoutManager) method.

In Java control statements break, continue, return, try-catch-finally, and assert belong to?

a) Select statements b) Loop Statements c) Transfer statements d) Pause Statement Answer c) Transfer statements

Which of the following is a mutable class in java?

a) java.lang.String b) java.lang.Byte c) java.lang.Short d) java.lang.StringBuilder Answer d) java.lang.StringBuilder

Which of the following are not Java keywords?

a) Double b) Switch c) Then d) Instanceof Answer: c) Then

Which of the following are valid array declarations?

a. int number(); b. float average[]; c. counter int[]; d. []double marks; Answer: b. float average[]; Explanation: The correct syntax for declaring an array is