JAVAJava基础JDK、JRE、JVM 字节码Java中引入了虚拟机的概念，即在机器和编译程序之间加入了一层抽象的虚拟机器。这台虚拟的机器在任何平台上都提供给编译程序一个的共同的接口。编译程序只需要面向虚拟机，生成虚拟机能够理解的代码，然后由解释器来将虚拟机代码转换为特定系统的机器码执行。在Java中，这种供虚拟机理解的代码叫做字节码（即扩展为.class的文件），它不面向任何特定的处理器，只
1. public class GC {2. private Object o;3. private voiddoSomethingElse(Object obj) { o = obj; }4. public void doSomething() {5.
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2022-03-16 10:35:09
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QUESTION139Giventhefollowingdirectorystructure:bigProject|--source||--Utils.java||--classes|--Andthefollowingcommandlineinvocation:javac-dclassessource/Utils.javaAssumethecurrentdirectoryisbigProject,
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2018-07-05 11:44:00
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publicclassGC{privateObjecto;privatevoiddoSomethingElse(Objectobj){o=obj;}publicvoiddoSomething(){Objecto=newObject();doSomethingElse(o);o=newObject();doSomethingElse(null);o=null;}}WhenthedoSomething
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2018-07-05 17:29:31
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1. public class GC {2. private Object o;3. private voiddoSomethingElse(Object obj) { o = obj; }4. public void doSomething() {5. Object o = new Object();6. doSomethingElse(o);7.
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2021-01-12 15:47:55
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1. public class GC {
2. private Object o;
3. private voiddoSomethingElse(Object obj) { o = obj; }
4. public void doSomething() {
5. Object o = new Object();
6. doSomethingElse(
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2021-07-26 14:55:45
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QUESTION230Given:classOne{publicOnefoo(){returnthis;}}classTwoextendsOne{publicOnefoo(){returnthis;}}classThreeextendsTwo{//insertmethodhere}Whichtwomethods,insertedindividually,correctlycompletetheTh
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2018-07-05 11:42:11
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QUESTION102Given:Object[]myObjects={newInteger(12),newString("foo"),newInteger(5),newBoolean(true)};Arrays.sort(myObjects);for(inti=0;i<myObjects.length;i++){System.out.print(myObjects[i]
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2018-07-05 17:25:23
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QUESTION46Given:publicclassTest{publicstaticvoidmain(String[]args){intx=5;booleanb1=true;booleanb2=false;16.if((x==4)&&!b2)System.out.print("1");System.out.print("2");if((b
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2018-07-05 17:26:36
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OCJP视频课堂，具体讲解：https://edu.csdn.net/course/detail/7811QUESTION 230 Given:10. class One {11. public One foo() { return this; }12. }13. class Two extends One {14. public One foo() { return this; }15. }16
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2021-01-11 22:31:50
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OCJP视频课堂，具体讲解：https://edu.csdn.net/course/detail/7811QUESTION 177 Given:1. class TestException extends Exception { }2. class A {3. public String sayHello(String name) throws TestException
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2021-01-11 22:33:56
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Given:11. public class Test {12. public static void main(String [] args) {13. int x = 5;14. boolean b1 = true;15. boolean b2 = false;16.17. if ((x == 4) && !b2 )18. System.out.print("1 ");19.
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2021-01-11 22:36:39
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OCJP视频课堂，具体讲解：https://edu.csdn.net/course/detail/7811QUESTION 102 Given:23.Object [] myObjects = {24.new Integer(12),25.new String("foo"),26.new Integer(5),27.new Boolean(true)28.};29.Arrays.so...
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2021-07-26 14:55:13
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OCJP视频课堂，具体讲解：https://edu.csdn.net/course/detail/7811QUESTION 150Click the Exhibit button. Given: ClassA a = new ClassA();
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2022-03-16 10:28:39
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OCJP视频课堂，具体讲解：https://edu.csdn.net/course/detail/7811QUESTION 230 Given:10.class One {11.public One foo() { return this; }12.}13.class Two extends One {14.public One foo() { return this; }15.}16...
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2022-04-06 14:18:57
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QUESTION 46Given:11. public class Test {12. public static void main(String [] args) {13. int x = 5;14. boolean b1 = true;15. boolean b2 = false;16.17. if ((x == 4) && !b2 )18. System.out.print...
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2022-03-16 10:30:48
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OCJP视频课堂en:1.class TestException extends Exception { }2.class A {3.public String sayHello(String name) throws TestException ...
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2022-03-16 10:37:25
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OCJP视频课堂，具139Giventhe following directory structure: bigProject |--source | |--Utils.java ||--classes |-- And the following command line invocation:...
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2022-03-16 10:38:20
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OCJP视频课堂，具体讲解：https://edu.csdn.net/course/detail/7811QUESTION 177 Given:1.class TestException extends Exception { }2.class A {3.public String sayHello(String name) throws TestException ...
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2021-07-26 14:53:55
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OCJ
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2021-07-26 14:54:59
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