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获取drawingpanel的用户输入,并在另一种方法中使用它

user-input methods java

Jocelyn Galvan · 技术社区 · 8 年前

我对java很陌生,我需要一些关于作业的帮助。任务是让用户输入(半径、x坐标和y坐标)在drawingPanel中绘制3个不同颜色的圆,我把这部分记下来了。第二部分要求我们提供一种静态方法,用于比较两个圆的半径,并让用户知道其中一个圆是否更小、更大或与另一个圆的大小相同。在比较两者的方法中,我很难找出如何使用半径的输入。

以下是我目前的代码:

import java.awt.*;
import java.util.*;
public class Circles {
  public static final Scanner CONSOLE = new Scanner(System.in);  


  public static void blueCircle(Graphics g) {
    g.setColor(Color.BLUE);
    int r = CONSOLE.nextInt();
    int x = CONSOLE.nextInt();
    int y = CONSOLE.nextInt();
    g.fillOval(0 + x, 0 + y, r * 2, r * 2); 
  }
  public static void greenCircle(Graphics g) {
    g.setColor(Color.GREEN);
    int r = CONSOLE.nextInt();
    int x = CONSOLE.nextInt();
    int y = CONSOLE.nextInt();
    g.fillOval(0 + x, 0 + y, r * 2, r * 2); 
  }
  public static void redCircle(Graphics g) {
    g.setColor(Color.RED);
    int r = CONSOLE.nextInt();
    int x = CONSOLE.nextInt();
    int y = CONSOLE.nextInt();
    g.fillOval(0 + x, 0 + y, r * 2, r * 2); 

  }
   public static void compareCircles(int r1, int r2) {
    int x;
    if (r1 < r2)
      x = -1;
    if (r1 == r2)
      x = 0;
    if (r1 > r2)
      x = 1;
    return;
  }
  public static void main(String[] args) {
    DrawingPanel panel = new DrawingPanel(400, 300);
    Graphics g = panel.getGraphics();
    System.out.println("Enter values for the radius, x , & y-coordinates of blue circle: ");
    blueCircle(g);
    System.out.println("Enter values for the radius, x , & y-coordinates of green circle: ");
    greenCircle(g);
    System.out.println("Enter values for the radius, x , & y-coordinates of red circle: ");
    redCircle(g);

  }


}

1 回复 | 直到 8 年前

Neero 8 年前

您可以减少实现中的代码重用。为给定输入参数创建圆的通用方法。

public static void blueCircle(Graphics g, int r, int x, int y, Color c) {
    g.setColor(c);
    g.fillOval(0 + x, 0 + y, r * 2, r * 2); 
}

public static String compareCircles(int r1, int r2) {  
       String output = "";
       if (r1 < r2)
           output = r1+" circle is smaller than "+r2;
       if (r1 == r2)
           output = "both circles are in same size.";
       if (r1 > r2)
           output = r1+" circle is larger than "+r2;
       return output;
}

现在在主方法中,获得必要的输入并将其传递给这些方法。

public static void main(String[] args) {
   DrawingPanel panel = new DrawingPanel(400, 300);
   Graphics g = panel.getGraphics();
   System.out.println("Enter values for the radius, x , & y-coordinates of blue circle: ");
   int rBlue = CONSOLE.nextInt();
   int xBlue = CONSOLE.nextInt();
   int yBlue = CONSOLE.nextInt();
   // Better to do the validation for the user inputs 
   blueCircle(g, rBlue, xBlue, yBlue, Color.BLUE);
   // Do the same thing for the other two circles. 
   // Then call the comparison method with your r input values like below.
   //String output = compareCircles(rBlue, rGreen);

希望这就是你想要的。。