Java软件中级工程师笔试题复杂逻辑

1、J2EE部分1、运算符优先级问题，下面代码的结果是多少(笔试)package test;public class Test public static void main( Stri ng args) int k = 0;in t ret = +k + k+ + +k + k;/ ret的值为多少2、运算符问题，下面代码分别输出什么(笔试)package test;public class Test public static void main( Stri ng args) int i1 = 10, i2 = 10;3、下面代码的结果是什么还是抛出异常(笔试)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、假设今天是9月8日，下面代码输出什么(笔试)package test;public class Test public static void main( Stri ng args) Date date = new Date();5、下面代码的输出结果是什么package te

3、st;public class Test public static void main( Stri ng args) double val = 11.5;6下面代码的结果是什么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、以下代码的结果是什么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、输出的结果是什么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;这样呢输出什么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有区别吗什么区别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、以下代码输出是什么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、输出的结果是什么12345根据单词排序还是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、以下代码输出的结果(笔试选择题)pu

11、blic class Test public static void main( Stri ng args) A. nullB. 0C. Test17、下面为一个单例的实现代码，请指出代码中有几个错误或不合理之处，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、 编程输出一个目录下的所有目录及文件名称，目录之间用tab。（笔试）1

12、9、从键盘读入10个整数，然后从大到小输出。（笔试）20、如何迭代Map容器，手写个试试答案：1、82、i1 + i2 = 1010语法错误i1 * i2 = 100i1 / i2 = 13、4、stri ng5195、6、12test11.0test12.07、8、test.Testtruetest.Basefalse9、10、1A: syn chro ni zed static是某个类的范围，synchroni zed static cSync防止多个线2程同时访问这个类中的synchronizedfalsestatic 方法。匕可以对类的所有对象头例起作用。？?？B: syn chro

13、ni zed是某实例的范围，synchronized isSy nc()防止多个线程同时访问这个实例中的synchronized 方法。11、 true false12、 true false true13、false14、015、 two five one three four16、B17、get In sta nee无默认返回值instanee?必须是 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);/注意这里的数组，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