Java軟件中級工程師筆試題復雜邏輯

1、J2EE部分1、運算符優(yōu)先級問題，下面代碼的結(jié)果是多少(筆試)package test;public class Test public static void main( Stri ng args) int k = 0;in t ret = +k + k+ + +k + k;/ ret的值為多少2、運算符問題，下面代碼分別輸出什么(筆試)package test;public class Test public static void main( Stri ng args) int i1 = 10, i2 = 10;3、下面代碼的結(jié)果是什么還是拋出異常(筆試)package test;pub

2、lic class Test public void myMethod(Stri ng str) public void myMethod(Object obj) public static void main( Stri ng args) Test t = new Test();t.myMethod( null);4、假設今天是9月8日，下面代碼輸出什么(筆試)package test;public class Test public static void main( Stri ng args) Date date = new Date();5、下面代碼的輸出結(jié)果是什么package te

3、st;public class Test public static void main( Stri ng args) double val = 11.5;6下面代碼的結(jié)果是什么package test;public class Test exte nds Base public static void main( Stri ng args) Base b = new Test();b.method();Test t = new Test();t.method();Overridepublic void method() class Base public void method() thro

4、ws In terruptedExceptio n 7、以下代碼的結(jié)果是什么package test;public class Test exte nds Base public static void main( Stri ng args) new Test().method();public void method() getName();class Base 8、true or falsepackage test;public class Test public static void main( Stri ng args) Stri ng str1 = new Strin g(&quo

5、t;abc");Stri ng str2 = new Stri ng("abc");Stri ngBuffer sb1 = new Stri ngBuffer("abc");Strin gBuffer sb2 = new Stri ngBuffer("abc");9、輸出的結(jié)果是什么package test;public class Test public static void main( Stri ng args) Systepublic int method1() int x = 1;try return x; fin

6、 ally public int method2() int x = 1;try return x; fin ally return +x;這樣呢輸出什么package test;public class Test public static void main( Stri ng args) public static boolea n method() try return true; fin ally return false;10、方法m和m2有區(qū)別嗎什么區(qū)別package test;public class Test public static void main( Stri ng a

7、rgs) public synchroni zed void m1() public static synchroni zed void m2() 11、true or false 理由package test;public class Test public static void main( Stri ng args) In teger i1 = 127;In teger i2 = 127;11 = 128;12 = 128;12、true or false 理由package test;public class Test public static void main( Stri ng

8、args) Stri ng str1 = "a"Stri ng str2 = "a"Stri ng str3 = new Stri ng("a");str3 = str3.i ntern();13、true or false 理由package test;public class Test public static void main( Stri ng args) 14、以下代碼輸出是什么package test;public class Test public static void main( Stri ng args) Big

9、 In teger one = new BigI nteger("1");Big In teger two = new BigI nteger("2");Big In teger three = new Bigl nteger("3");Big In teger sum = new Bigl nteger("O"); sum.add( on e);sum.add(two); sum.add(three);15、輸出的結(jié)果是什么12345根據(jù)單詞排序還是package test;public class Test p

10、ublic static void main( Stri ng args) SetvStri ng> set = new HashSetvStri ng>(); set.add("o ne");set.add("two");set.add("three");set.add("four");set.add("five");for (IteratorvStri ng> it = set.iterator(); it.hasNext();) 16、以下代碼輸出的結(jié)果(筆試選擇題)pu

11、blic class Test public static void main( Stri ng args) A. nullB. 0C. Test17、下面為一個單例的實現(xiàn)代碼，請指出代碼中有幾個錯誤或不合理之處，并改正public class Test public Test in sta nee = n ull;public static Test get In sta nce() if (in sta nee = n ull) in sta nee = new Test();retur n in sta nee;18、 編程輸出一個目錄下的所有目錄及文件名稱，目錄之間用tab。（筆試）1

12、9、從鍵盤讀入10個整數(shù)，然后從大到小輸出。（筆試）20、如何迭代Map容器，手寫個試試答案：1、82、i1 + i2 = 1010語法錯誤i1 * i2 = 100i1 / i2 = 13、4、stri ng5195、6、12test11.0test12.07、8、test.Testtruetest.Basefalse9、10、1A: syn chro ni zed static是某個類的范圍，synchroni zed static cSync防止多個線2程同時訪問這個類中的synchronizedfalsestatic 方法。匕可以對類的所有對象頭例起作用。？?？B: syn chro

13、ni zed是某實例的范圍，synchronized isSy nc()防止多個線程同時訪問這個實例中的synchronized 方法。11、 true false12、 true false true13、false14、015、 two five one three four16、B17、get In sta nee無默認返回值instanee?必須是 static18、package test;public class Test public static void main( Stri ng args) new Test().read("D:/test", &quo

14、t;");public void read(Stri ng path, String tab) File file = new File(path);File childFiles = file.listFiles();for (int i = 0; childFiles != null && i < childFiles.length; i+) if (childFilesi.isDirectory() read(childFilesi.getPath(), tab + "t");19、package test;public class T

15、est public static void main( Stri ng args) Sea nner in = new Sea nn er(System.i n);/注意這里的數(shù)組，不是int的In teger arr = new In teger10;for (int i = 0; i < 10; i+) arri = in.n extl nt();Arrays.sort(arr, new Comparator <ln teger>() Overridepublic int compare(l nteger o1, In teger o2) if (o1 > o2) return -1;if (o1 < o2) return 1;return 0;)；20、package test;public class Test public static void main( Stri ng args) MapvCIass, Stringm = new HashMapvCIass, Stri ng&g