如下代码,输出结果是什么? public class Test { public int aMethod() { static int i = 0; i++; return i; } public static void main (String args[]) { Test test = new Test(); test.aMethod(); int j = test.aMethod(); System.out.println(j); } }

时间: 2024-01-13 22:05:38 浏览: 130
这段代码是有语法错误的,因为在方法 aMethod() 中定义了一个静态变量 i,但是静态变量不能在方法中定义,只能在类中定义。 如果将静态变量 i 定义在类中,则输出的结果是 2。因为第一次调用 aMethod() 方法时,i 的值从 0 变为 1,并将 1 返回;第二次调用 aMethod() 方法时,i 的值从 1 变为 2,并将 2 返回。最后输出的 j 的值是 2。以下是修正后的代码: ``` public class Test { static int i = 0; public int aMethod() { i++; return i; } public static void main (String args[]) { Test test = new Test(); test.aMethod(); int j = test.aMethod(); System.out.println(j); } } ```
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public class Test { public int aMethod() { static int i = 0; i++; return i; } public static void main (String args[]) { Test test = new Test(); test.aMethod(); int j = test.aMethod(); System.out.println(j); } }

这段代码有语法错误,无法通过编译。静态变量不能在方法内部声明。正确的写法应该是将静态变量 i 声明在方法外部,如下所示: ``` public class Test { static int i = 0; public int aMethod() { i++; return i; } public static void main(String[] args) { Test test = new Test(); test.aMethod(); int j = test.aMethod(); System.out.println(j); } } ``` 此时输出结果为 2,因为 i 的值在两次调用 aMethod 方法时分别增加了 1。

请你将代码修改为用MASM汇编public class Test { public static final int KEY = 7; public static void main(String[] args) { String str = "Hello World!"; StringBuffer str2 = new StringBuffer(); //存储加密后的字符串 StringBuffer str3 = new StringBuffer(); //存储解密后的字符串 //加密过程 for(int i=0;i<str.length();i++) { char c = (char)(str.charAt(i) ^ KEY); str2.append(c); } //解密过程 for(int i=0;i<str2.length();i++) { char c = (char)(str2.charAt(i) ^ KEY); str3.append(c); } System.out.println("原始 的字符串为:" + str); System.out.println("加密后 的字符串为:" + str2); System.out.println("解密后 的字符串为:" + str3); } } 输出: 格式为DATAS SEGMENT ;此处输入数据段代码 DATAS ENDS STACKS SEGMENT ;此处输入堆栈段代码 STACKS ENDS CODES SEGMENT ASSUME CS:CODES,DS:DATAS,SS:STACKS START: MOV AX,DATAS MOV DS,AX ;此处输入代码段代码 MOV AH,4CH INT 21H CODES ENDS END START

对于Java程序的转换,需要进行以下步骤: 1. 将Java代码转换为汇编代码,使用Java虚拟机(JVM)来执行Java程序,然后将其转换为汇编代码。 2. 根据汇编代码的语法规则,将其转换为MASM汇编代码。 下面是Test.java转换为汇编代码的示例: ``` .class public Test .super java/lang/Object .field public static final KEY:I = 7 .method public static main([Ljava/lang/String;)V .limit stack 2 .limit locals 3 ldc "Hello World!" astore_1 new java/lang/StringBuffer dup invokespecial java/lang/StringBuffer/<init>()V astore_2 new java/lang/StringBuffer dup invokespecial java/lang/StringBuffer/<init>()V astore_3 iconst_0 istore 4 loop: iload 4 aload_1 invokevirtual java/lang/String/length()I if_icmpge end_loop aload_1 iload 4 invokevirtual java/lang/String/charAt(I)C iload_0 ixor i2c invokevirtual java/lang/StringBuffer/append(C)Ljava/lang/StringBuffer; pop iinc 4, 1 goto loop end_loop: iconst_0 istore 4 loop2: iload 4 aload_2 invokevirtual java/lang/StringBuffer/length()I if_icmpge end_loop2 aload_2 iload 4 invokevirtual java/lang/StringBuffer/charAt(I)C iload_0 ixor i2c invokevirtual java/lang/StringBuffer/append(C)Ljava/lang/StringBuffer; pop iinc 4, 1 goto loop2 end_loop2: getstatic java/lang/System/out Ljava/io/PrintStream; ldc "原始的字符串为:" invokevirtual java/io/PrintStream/print(Ljava/lang/String;)V aload_1 invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V getstatic java/lang/System/out Ljava/io/PrintStream; ldc "加密后的字符串为:" invokevirtual java/io/PrintStream/print(Ljava/lang/String;)V aload_2 invokevirtual java/lang/StringBuffer/toString()Ljava/lang/String; invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V getstatic java/lang/System/out Ljava/io/PrintStream; ldc "解密后的字符串为:" invokevirtual java/io/PrintStream/print(Ljava/lang/String;)V aload_3 invokevirtual java/lang/StringBuffer/toString()Ljava/lang/String; invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V return .end method ``` 下面是将上述汇编代码转换为MASM汇编代码的示例: ``` DATAS SEGMENT DATAS ENDS STACKS SEGMENT DW 64 DUP(?) STACKS ENDS CODES SEGMENT ASSUME CS:CODES,DS:DATAS,SS:STACKS START: MOV AX,DATAS MOV DS,AX ; 初始化局部变量 MOV CX,0 ; i=0 MOV DX,0 ; 存储加密后的字符串的下标 MOV BX,0 ; 存储解密后的字符串的下标 ; 加密过程 loop1: MOV AX,CX PUSH AX MOV AX,DATAS+1 PUSH AX CALL java/lang/String/length ADD SP,4 CMP AX,CX JLE end_loop1 MOV AX,CX PUSH AX MOV AX,1 PUSH AX MOV AX,DATAS+3 MOV BX,DX ADD AX,BX MOVZX BX,WORD PTR [AX] MOV AX,DATAS+2 MOV CX,7 XOR BX,CX MOV CX,BX MOV AX,DATAS+5 MOV BX,DX ADD AX,BX MOV BYTE PTR [AX],CL INC DX ADD SP,4 JMP loop1 end_loop1: MOV CX,0 MOV BX,0 ; 解密过程 loop2: MOV AX,CX PUSH AX MOV AX,DATAS+1 PUSH AX CALL java/lang/StringBuffer/length ADD SP,4 CMP AX,CX JLE end_loop2 MOV AX,CX PUSH AX MOV AX,1 PUSH AX MOV AX,DATAS+7 MOV BX,BX ADD AX,BX MOVZX BX,WORD PTR [AX] MOV AX,DATAS+6 MOV CX,7 XOR BX,CX MOV CX,BX MOV AX,DATAS+9 MOV BX,BX ADD AX,BX MOV BYTE PTR [AX],CL INC BX ADD SP,4 JMP loop2 end_loop2: ; 输出结果 MOV DX,OFFSET FLAT:DATAS+10 MOV AH,9 INT 21h MOV DX,DATAS+1 MOV AH,9 INT 21h MOV DX,OFFSET FLAT:DATAS+11 MOV AH,9 INT 21h MOV DX,DATAS+7 MOV AH,9 INT 21h MOV DX,DATAS+12 MOV AH,9 INT 21h MOV DX,DATAS+7 MOV AH,9 INT 21h MOV DX,DATAS+13 MOV AH,9 INT 21h MOV DX,DATAS+7 MOV AH,9 INT 21h MOV DX,DATAS+14 MOV AH,9 INT 21h MOV AX,4C00h INT 21h CODES ENDS END START ``` 请注意,这只是一个示例代码,需要根据具体情况进行修改。
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use java language ,In this project you need to write a book lending system for a Library. The system has different roles for registered users. There are two types of user roles: borrower and lender. Write an IUser interface for library users, with the following UML specification: +----------------------------------+ | <<interface>> | | IUser | +----------------------------------+ | + getName(): String | | + getBook(): int | | + moreBook(int number): void | +----------------------------------+ and a User class that implements IUser and has the following UML specification: +-----------------------------------+ | User | +-----------------------------------+ | - name: String | | - book: int | +-----------------------------------+ | + User(String name, int book) | | + getName(): String | | + getBook(): int | | # setBook(int book): void | | + moreBook(int number): void | | + testUser(): void | +-----------------------------------+ The name instance variable indicates the user name. The book instance variable indicates the number of books borrowed by the user. The setBook method changes the number of books borrowed by the user. The setBook method is protected, not public. This means that only subclasses of the User class can use the setBook method. All the other classes in the system cannot use the setBook method, so they cannot change the number of books borrowed by a user. The purpose of the moreBook method is to increase the number of books borrowed or lent by the user (depending on what kind of user it is) by the number given as argument to the method. The moreBook method of the User class is abstract, since we do not know what kind of role the user is (a borrower borrows books from other users and a lender lend books to other users). Also add to your program a Test class to test your User class. public class Test { public static void main(String[] args) { User.testUser(); } }

帮我写出以下java代码:Add a class Bubble that extends Shape. The Bubble class has an instance variable called radius of type double that represents the radius of the bubble. The constructor of the Bubble class takes an x and a y as arguments, which represent the position of the new bubble. The radius of a new bubble is always 10 and never changes after that. The isVisible method indicates whether the bubble is currently visible inside a window of width w and height h (position (0, 0) is in the upper-left corner of the window). The bubble is considered visible if at least one pixel of the bubble is visible. Therefore a bubble might be visible even when its center is outside the window, as long as the edge of the bubble is still visible inside the window. The code of the isVisible method is a little bit complex, mostly because of the case where the center of the circle is just outside one of the corners of the window. So here is the code of the isVisible method, which you can directly copy-paste into your assignment: // Find the point (wx, wy) inside the window which is closest to the // center (x, y) of the circle. In other words, find the wx in the // interval [0, w - 1] which is closest to x, and find the wy in the // interval [0, h - 1] which is closest to y. // If the distance between (wx, wy) and (x, y) is less than the radius // of the circle (using Pythagoras's theorem) then at least part of // the circle is visible in the window. // Note: if the center of the circle is inside the window, then (wx, wy) // is the same as (x, y), and the distance is 0. public boolean isVisible(int w, int h) { double x = getX(); double y = getY(); double wx = (x < 0 ? 0 : (x > w - 1 ? w - 1 : x)); double wy = (y < 0 ? 0 : (y > h - 1 ? h - 1 : y)); double dx = wx - x; double dy = wy - y; return dx * dx + dy * dy <= radius * radius; } The isIn method indicates whether the point at coordinates (x, y) (which are the arguments of the method) is currently inside the bubble or not. The edge of the bubble counts as being inside of the bubble. HINT: use Pythagoras's theorem to compute the distance from the center of the bubble to the point (x, y). The draw method uses the graphics object g to draw the bubble. HINT: remember that the color of the graphics object g is changed in the draw method of the superclass of Bubble. Also add a testBubble method to test all your methods (including inherited methods, but excluding the isVisible method, which I provide, and excluding the draw method since it requires as argument a graphics object g that you

根据以下要求:Instead of using a binary file to save the arraylist of points, change the savaData method and the constructor of the Model class to use a database to write / read the coordinates of all the points. Use XAMPP and phpMyAdmin to create a database called "java" with a table called "points" that has two integer columns x and y (in addition to the ID primary key). Hint: make sure you delete all the old point coordinates from the database before inserting new ones. Hint: use phpMyAdmin to check what is stored in the database. Use the Test class to run all the tests for the software and check that all the tests still work. Use the Start class to run the software and check that closing the software correctly saves the point coordinates in the database (use phpMyAdmin to check the content of the database). Run the software again and check that all the points from the previous run are correctly displayed,修改下述代码:public class Model implements Serializable { private ArrayList points; private ArrayList<ModelListener> listeners; private static final String FILE_NAME = "points.bin"; public Model() { points = new ArrayList(); listeners = new ArrayList<ModelListener>(); // Read points from file if it exists File file = new File(FILE_NAME); if (file.exists()) { try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(file)); points = (ArrayList) in.readObject(); in.close(); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } } public void addListener(ModelListener l) { listeners.add(l); } public ArrayList getPoints() { return points; } public void addPoint(Point p) { points.add(p); notifyListeners(); // points changed so notify the listeners. saveData(); // save point to file } public void clearAllPoints() { points.clear(); notifyListeners(); // points changed so notify the listeners. saveData(); // save empty list to file } public void deleteLastPoint() { if (points.size() > 0) { points.remove(points.size() - 1); notifyListeners(); // points changed so notify the listeners. saveData(); // save updated list to file } } private void notifyListeners() { for (ModelListener l : listeners) { l.update(); // Tell the listener that something changed. } } public int numberOfPoints() { return points.size(); } public void saveData() { try { ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_NAME)); out.writeObject(points); out.close(); } catch (IOException e) { e.printStackTrace(); } }

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Also create a ControllerCreate class that extends Controller.The create method takes as arguments the name of a new library user, a number of books (as a string), and an integer representing the role of user to create (where the integer 0 means a lender and the integer 1 means a borrower). The create method of the controller then transforms the book number from a string to an integer (using the Integer.parseInt static method), creates an object from the correct class (based on the role specified by the user input: lender or borrower) and calls the addUser method of the library to add the new user object to the library. • If no exception occurs then the create method of the controller returns the empty string. • If the constructor of the Borrower class throws a NotALenderException then the create method of the controller must catch this exception and return as result the error message from the exception object. • If the parseInt method of the Integer class throws a NumberFormatException (because the user typed something which is not an integer) then the create method of the controller must catch this exception and return as result the error message from the exception object. Modify the run method of the GUI class to add a ViewCreate view that uses a ControllerCreate controller and the same model as before (not a new model!) Do not delete the previous views. Note: if at the end of Question 7 you had manually added to your library (model object) some users for testing, then you must now remove those users from the run method of the anonymous class inside the GUI class. You do not need these test users anymore because you have now a graphical user interface to create new users! Run your GUI and check that you can correctly use the new view to create different users for your library, with different types of roles. • Check that, when you create a new user, the simple view is automatically correctly updated to show the new total number of books borrowed by all users. • Also use the “get book” view to check that the users are correctly created with the correct names and correct number of books. • Also check that trying to create a borrower with a negative number of books correctly shows an error message. Also check that trying to create a user with a number of books which is not an integer correctly shows an error message (do not worry about the content of the error message). After you created a new user, you can also check whether it is a lender or a borrower using the “more book” view to increase the number of books of the user by a big negative number: • if the new user you created is a lender, then increasing the number of books by a big negative value will work and the number of books borrowed by the user will just become a larger value (you can then check that using the “get book” view); • if the new user you created is a borrower, then increasing the number of books by a big negative value will fail with an error message and the number of books borrowed by the user will not change (you can then check that using the “get book” view). 完成符合以上要求的java代码

Also create a ControllerMoreBook class that extends Controller.The moreBook method takes the name of a user and a number of books (as a string) as arguments. The moreBook method of the controller then transforms the number of books from a string to an integer (using the Integer.parseInt static method) and calls the moreBook method of the library to increase the number of books borrowed or lent by the user (depending on what kind of user it is) of a specific user, by the given argument. • If no exception occurs then the moreBook method of the controller returns the empty string. • If the moreBook method of the library throws an UnknownUserException then the moreBook method of the controller must catch this exception and return as result the error message from the exception object. • If the moreBook method of the library throws a NotALenderException then the moreBook method of the controller must catch this exception and return as result the error message from the exception object. • If the parseInt method of the Integer class throws a NumberFormatException (because the user typed something which is not an integer) then the moreBook method of the controller must catch this exception and return as result the error message from the exception object. Note: to keep things simple, it is allowed for a user of your system to increase the number of books of a user by a negative number, so there is no need to check for that. Modify the run method of the GUI class to add a ViewMoreBook view that uses a ControllerMoreBook controller and the same model as before (not a new model!) Do not delete the previous views. Run your GUI and check that you can correctly use the new view to increase the number of books for different users of your library (obviously your library must have some users in it to test this: see the last paragraph of Question 7). • Check that, when you increase a user’s book, the simple view is automatically correctly updated to show the new total number of borrowed books for all users of the library. • Also use the “get book” view to check that the user’s book value correctly changed. • Also check that increasing the book number of an unknown user correctly shows an error message.Also check that increasing the book of a user by a large negative number correctly shows an error message. Also check that trying to increase the book of a user by a number which is not an integer correctly shows an error message (do not worry about the content of the error message). 完成符合以上要求的java代码

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