java考试试题及答案（国外英文资料）.docVIP

java考试试题及答案（国外英文资料） In January 2009, the national high education self-study exam The Java language programming (1) test Course code: 04747 One, a single choice of choice. (10 points for each question, 10 points for each question.) Only one of the four candidates listed in each of the items is eligible for the title. Please fill in the following brackets. Neither choice, choice, nor choice is all. The following character combinations cannot be used as Java integer constants () A. b. 078 0 x3acb C. d. 5000 0 x3abc The output of the following program code is () Int x = 10; While (x 7) (1). X --; } * * * * * * * * * * * * * * * * * * Create a class U declaration, and the definition of the object U and v is as follows: The class U { Int x, int y; U (int a, int b) {x = a; Y = b; } Void copy (U a) {x = a.x; Y = a.y; } } U U = new U (1, 2), v = new U (2, 3); In the following code for selection, the system that might cause the system to reclaim memory is () A.U.X = v.y; U.y = v.x; B.u = v; C.U.C opy (v); D.V.C opy (u); Set up the following code: String s l = 123; String s2 = 123; String s3 = new String ( 123 ); The values of s1 = = = s2 and s1 = = =. A.t rue, true b. alse, false C.t rue, false D.f alse, true The following statement on the relationship between AWT and Swing is correct () A.S wing is the improvement and extension of AWT When writing GUI programs, AWT and Swing cannot be used at the same time C.A WT and Swing have the same representation on different platforms The classes in the D.A WT are inherited from Swing In the following Swing components, you can specify the layout manager for it () A.J ScrollBar object B.J MenuBar object C.j. ComboBox object D.J Dialog object General drawing programs define a JPanel subclass. To redefine a method in the JPanel subclass, call the drawing method in this method and draw the various shapes. The way to redefine this is () A.p aint () B.p aintComponent () C.r epaint () D.u pdate () The main job of implementing multithreading