動力節(jié)點入學測試(中文)

1、北京動力節(jié)點教育科技有限公司 姓名：_孫海闊_ qq：_369019497_注意：如果沒有特殊說明那么為單選question 1given:35. string #name = jane doe;36. int $age=24;37. double _height = 123.5;38. double temp = 37.5;下面有兩個答案是正確的？a. 35行不能編譯通過b. 36行不能編譯通過c. 37行不能編譯通過d. 38行不能編譯通過answer: ad question 2given:11. public class test 12. public static void main

2、(string args) 13. int x =5;14. boolean b1 = true;15. boolean b2 = false;16.17.if(x=4) & !b2)18. system.out.print(l );19. system.out.print(2 );20. if (b2 = true) & b1)21. system.out.print(3);22. 23. 輸出結(jié)果?a. 2b. 3c. 1 2d. 2 3e. 1 2 3f. 編譯錯誤g. 拋出運行期異常answer: d question 3given:11. public static void mai

3、n(string args) 12. for (int i=0;i6) break;14. 15. system.out.println(i);16. 輸出結(jié)果?a. 6b. 7c. 10d. 11e. 編譯錯誤.f. 拋出運行時異常.answer: e question 4given:13. public class pass 14. public static void main(string args) 15. int x 5;16. pass p = new pass();17. p.dostuff(x);18. system.out.print(main x = + x);19. 2

4、0.21. void dostuff(int x) 22. system.out.print( dostuffx =+ x+);23. 24. 輸出結(jié)果?a. 編譯錯誤.b. 發(fā)生運行期異常.c. dostuffx = 6 main x = 6d. dostuffx = 5 main x = 5e. dostuffx = 5 main x = 6f. dostuffx = 6 main x = 5answer: d question 5given:11. public static void main(string args) 12. object obj =new int 1,2,3 ;13

5、. int somearray = (int)obj;14. for (int i: somearray) system.out.print(i + )15. 輸出結(jié)果?a. 1 2 3b. 在12行發(fā)生編譯錯誤.c. 在13行發(fā)生編譯錯誤.d. 在14行發(fā)生編譯錯誤.e. 拋出classcastexception異常.answer: a question 6given:11. public interface status 12. /* 請再這里加入代碼 */ int my_value = 10;13. 在第12行加入的代碼，下面有3個是正確的?a. finalb. staticc. nat

6、ived. publice. privatef. abstractg. protectedanswer: abd question 7given:1. public class a 2. public void doit() 3. 4. public string doit() 5. return a;6. 7. public double doit(int x) 8. return 1.0;9. 10.輸出結(jié)果?a. 發(fā)生異常.b. 第7行編譯錯誤.c. 第4行編譯錯誤.d. 編譯成功.answer: d question 8given:10. interface a void x(); 1

7、1. class b implements a public void x() public void y() 12. class c extends b public void x() and:20. java.util.list list = new java.util.arraylist();21. list.add(new b();22. list.add(new c();23. for (a a:list) 24. a.x();25. a.y();26. 輸出結(jié)果?a. 該代碼沒有輸出結(jié)果.b. 拋出異常.c. 第20行編譯錯誤.d. 第21行編譯錯誤.e. 第23行編譯錯誤.f.

8、第25行編譯錯誤.answer: e question 9given:1. class superclass 2. public a geta() 3. return new a();4. 5. 6. class subclass extends superclass 7. public b geta() 8. return new b();9. 10. 下面哪種情況是正確的?a. 如果a繼承b編譯正確.b. 如果b繼承a編譯正確.c. 第7行編譯錯誤.d. 第8行編譯錯誤.answer: c question 10given:11. class classa 12. class classb

9、 extends classa 13. class classc extends classa and:21. classa p0 = new classa();22. classb p1 = new classb();23. classc p2 = new classc();24. classa p3 = new classb();25. classa p4 = new classc();下面答案有三個是正確的？a. p0 = p1;b. p1 =p2;c. p2 = p4;d. p2 = (classc)p1;e. p1 = (classb)p3;f. p2 = (classc)p4;an

10、swer: cdf question 11given:10. abstract class a 11. abstract void al();12. void a2() 13. 14. class b extends a 15. void a1() 16. void a2() 17. 18. class c extends b void c1() and:a x = new b(); c y = new c(); a z = new c();下面答案中哪四個為多態(tài)調(diào)用？a. x.a2();b. z.a2();c. z.c1();d. z.a1();e. y.c1();f. x.a1();ans

11、wer: bdf question 12given:10. public class hello 11. string title;12. int value;13. public hello() 14. title += world;15. 16. public hello(int value) 17. this.value = value;18. title = hello;19. hello();20. 21. and:30. hello c = new hello(5);31. system.out.println(c.title);輸出結(jié)果?a. hellob. hello worl

12、dc. 編譯錯誤.d. hello world 5e. 沒有輸出結(jié)果.f. 拋出異常.answer: b question 13given:10. public class foo 11. static int a;12. static a0=2; 13. public static void main( string args) 14. 運行以上代碼將會拋出什么異常？a. java.lang. stackoverflowerrorb. java.lang.illegalstateexceptionc. java.lang.exceptionlnlnitializererrord. java.

13、lang.arraylndexoutofboundsexceptionanswer: c question 14given:1. import java.util.*;2. public class example 3. public static void main(string args) 4. / 加入代碼5. set.add(new integer(2);6. set.add(new integer(l);7. system.out.println(set);8. 9. 將哪個代碼加入到第4行，輸出為1, 2?a. set set = new treeset();b. set set

14、= new hashset();c. set set = new sortedset();d. list set = new sortedlist();e. set set = new linkedhashset();answer: e question 15given:11. public class person 12. private string name, comment;13. private int age;14. public person(string n, int a, string c) 15. name = n; age = a; comment = c;16. 17.

15、 public boolean equals(object o) 18. if(! (o instanceof person) return false;19, person p = (person)o;20. return age = p.age & name.equals();21. 22. 在person類中如何定義hashcode()方法是正確的?a. return super.hashcode();b. return name.hashcode() + age * 7;c. return name.hashcode() + comment.hashcode() /2;d.

16、 return name.hashcode() + comment.hashcode() / 2 - age * 3;answer: d question 16given:1. public class threads3 implements runnable 2. public void run() 3. system.out.print(running);4. 5. public static void main(string args) 6. thread t = new thread(new threads3();7. t.run();8. t.run();9. t.start();1

17、0. 11. 輸出結(jié)果?a. 編譯錯誤b. 拋出異常.c. 輸出 running.d. 輸出 runningrunning.e. 輸出 runningrunningrunning.answer: e question 17given:1. public class threads4 2. public static void main (string args) 3. new threads4().go();4. 5. public void go() 6. runnable r = new runnable() 7. public void run() 8. system.out.print(foo);9. 10. ;11. thread t = new thread(r);12. t.start();13. t.start();14. 15. 輸出結(jié)果?a. 編譯錯誤.b. 拋出異常.c. 執(zhí)行正常，輸出 foo.d. 執(zhí)行正常，沒有輸出.answer: b question 18選出3個編譯正確的？a. private synchronized object o;b. void