我似乎無法找到什麼導致與我的for循環錯誤

-2

我正在java中介紹計算機科學類。我試圖寫一個圖形程序來解決這個問題......我似乎無法找到什麼導致與我的for循環錯誤

「設計一個代表具有指定半徑和顏色的星形的類，使用填充多邊形繪製星形。在隨機位置繪製10顆隨機半徑的程序。「

所以我完成了我認爲是相當直接的代碼，但是當我去編譯程序時，我得到了48個錯誤。編譯器似乎在抱怨程序的幾乎所有行。

任何幫助解決這些問題，非常感謝。（我希望這是一個簡單的錯誤，正在影響大部分程序。）

在此先感謝。

這裏是錯誤的列表（與文件位置刪除）：

48 errors found: 
File: C...Star.java [line: 15] 
Error: illegal start of type 
File: C...Star.java [line: 15] 
Error: ')' expected 
File: C...Star.java [line: 15] 
Error: illegal start of type 
File: C...Star.java [line: 15] 
Error: <identifier> expected 
File: C...Star.java [line: 15] 
Error: ';' expected 
File: C...Star.java [line: 15] 
Error: illegal start of type 
File: C...Star.java [line: 15] 
Error: <identifier> expected 
File: C...Star.java [line: 15] 
Error: <identifier> expected 
File: C...Star.java [line: 15] 
Error: illegal start of type 
File: C...Star.java [line: 15] 
Error: <identifier> expected 
File: C...Star.java [line: 16] 
Error: ';' expected 
File: C...Star.java [line: 17] 
Error: ']' expected 
File: C...Star.java [line: 17] 
Error: ';' expected 
File: C...Star.java [line: 17] 
Error: <identifier> expected 
File: C...Star.java [line: 17] 
Error: illegal start of type 
File: C...Star.java [line: 17] 
Error: ';' expected 
File: C...Star.java [line: 18] 
Error: ']' expected 
File: C...Star.java [line: 18] 
Error: illegal start of type 
File: C...Star.java [line: 18] 
Error: <identifier> expected 
File: C...Star.java [line: 18] 
Error: ';' expected 
File: C...Star.java [line: 18] 
Error: illegal start of type 
File: C...Star.java [line: 18] 
Error: illegal start of type 
File: C...Star.java [line: 18] 
Error: ';' expected 
File: C...Star.java [line: 19] 
Error: ']' expected 
File: C...Star.java [line: 19] 
Error: illegal start of type 
File: C...Star.java [line: 19] 
Error: <identifier> expected 
File: C...Star.java [line: 19] 
Error: ';' expected 
File: C...Star.java [line: 19] 
Error: illegal start of type 
File: C...Star.java [line: 19] 
Error: illegal start of type 
File: C...Star.java [line: 19] 
Error: ';' expected 
File: C...Star.java [line: 22] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 25] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 28] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 29] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 31] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 31] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 31] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 34] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 35] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 36] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 37] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 47] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 50] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 52] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 52] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 52] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 55] 
Error: class, interface, or enum expected 
File: C...Star.java [line: 56] 
Error: class, interface, or enum expected

星類：

import java.util.Random; 
import javax.swing.JPanel; 
import java.awt.*; 

public class Star extends JPanel 
{ 
    Random random = new Random(); 

    int radius = random.nextInt(10)+1; 

    int[] xPos = new int[10]; 
    int[] yPos = new int[10]; 
    int[] rad = new int[10]; 

    for(int i=0; i!=10; i++) 
    { 
    int xPos[i] = random.nextInt(200)+1; 
    int yPos[i] = random.nextInt(200)+1; 
    int rad[i] = random.nextInt(10)+1; 
    } 

    public Star() 
    { 
    setPreferredSize(new Dimension(200, 200)); 
    } 

    int[] xStar = new int[10]; 
    int[] yStar = new int[10]; 
    int[] rad = new int[10]; 

    for(int ii=0; ii!=10; ii++) 
    { 
    private int[] (xStar[ii]) = {1*rad[ii]+ xPos[ii], 3*rad[ii]+ xPos[ii], 3*rad[ii]+ xPos[ii], 5*rad[ii]+ xPos[ii], 7*rad[ii]+ xPos[ii], 5*rad[ii]+ xPos[ii] }; 
    private int[] (yStar[ii]) = {5*rad[ii]+ yPos[ii], 4*rad[ii]+ yPos[ii], 1*rad[ii]+ yPos[ii], 3*rad[ii]+ yPos[ii], 3*rad[ii]+ yPos[ii], 5*rad[ii]+ yPos[ii] }; 
    private int[] (xStar2[ii]) = {1*rad[ii]+ xPos[ii], 3*rad[ii]+ xPos[ii], 3*rad[ii]+ xPos[ii], 5*rad[ii]+ xPos[ii], 7*rad[ii]+ xPos[ii], 5*rad[ii]+ xPos[ii] }; 
    private int[] (yStar2[ii]) = {5*rad[ii]+ yPos[ii], 6*rad[ii]+ yPos[ii], 9*rad[ii]+ yPos[ii], 7*rad[ii]+ yPos[ii], 7*rad[ii]+ yPos[ii], 5*rad[ii]+ yPos[ii] }; 
    } 

    //----------------------------------------------------------------- 
    // Constructor: Sets up the basic characteristics of this panel. 
    //----------------------------------------------------------------- 

    //----------------------------------------------------------------- 
    // Draws a Star using polygons and polylines. 
    //----------------------------------------------------------------- 

    public void paintComponent(Graphics page) 
    { 
     super.paintComponent(page); 
     page.setColor(Color.red); 

     for(int iii=0; iii!=10; iii++) 
     { 
     page.fillPolygon(yStar[iii], xStar[iii], xStar[iii].length); 
     page.fillPolygon(yStar2[iii], xStar2[iii], xStar2[iii].length); 
     } 

    } 
}

星畫家（亞軍）：

import javax.swing.JFrame; 

public class StarClassCrushingMyDreams 
{ 
    //----------------------------------------------------------------- 
    // Creates the main frame of the program. 
    //----------------------------------------------------------------- 
    public static void main(String[] args) 
    { 

     JFrame frame = new JFrame("Rocket"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setSize(300,300); 


     Star panel = new Star(); 



     frame.getContentPane().add(panel); 
     frame.setVisible(true); 

     frame.setVisible(true); 
    } 
}

來源

2016-03-15 Ramalious

-1

你」我已經把你的循環放在課堂範圍內，而不是在一個方法裏面。這不合法。

並且你在for循環的範圍內聲明瞭xPos等，所以你實際上不會設置類變量，只是for循環中的影子副本。

因爲我在這裏：讓每個明星一個JPanel看起來「奇怪」，難道你不想在同一個面板中畫出10顆星嗎？

來源

2016-03-15 01:22:28 John3136

還有在初始化塊或構造不屬for環（如@ John3136的答案），環路的內容無效：

int xPos[i] = random.nextInt(200)+1;

應該

xPos[i] = random.nextInt(200)+1;

你沒有聲明一個變量，你只是給現有的數組賦值。

同理：

private int[] (xStar[ii]) = {1*rad[ii]+ xPos[ii], 3*rad[ii]+ xPos[ii], 3*rad[ii]+ xPos[ii], 5*rad[ii]+ xPos[ii], 7*rad[ii]+ xPos[ii], 5*rad[ii]+ xPos[ii] };

我不知道你要在這裏寫的是什麼。當然private int[]不應該在那裏，但也xStar有類型int[]，而不是int[][]。

此外，您還沒有在任何地方宣佈xStar2或yStar2。

來源

2016-03-15 01:37:30

我似乎無法找到什麼導致與我的for循環錯誤

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