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在我的代碼中，我需要使用if語句，具體取決於用戶輸入什麼來繪製一定數量的棋子。所以如果用戶輸入4個棋子，我需要其中的三個棋子進入隨機點。所以我需要在我的畫布尺寸之間產生隨機的x和y座標。我知道我需要使用隨機數字生成器，但我不確定它是如何工作的。請幫助我。由於 這裏是我的代碼...需要Java隨機數生成器幫助
import javax.swing.*;
import java.awt.*;
import java.util.*;
public class ChessSet extends JPanel
{
public int numPawns;
public int numBishops;
public static void main()
{
JFrame ourFrame = new JFrame();
ourFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ourFrame.setSize(1000,1000);
ChessSet ourChessSet = new ChessSet();
Scanner key = new Scanner(System.in);
System.out.println("How many pawns would you like? (0-4): ");
ourChessSet.numPawns = key.nextInt();
System.out.println("How many bishops would you like? (0-4): ");
ourChessSet.numBishops = key.nextInt();
ourFrame.add(ourChessSet);
ourFrame.setBackground(Color.white);
ourFrame.setVisible(true);
}
public void paint(Graphics canvas)
{
ChessSet inst1 = new ChessSet();
this.drawPawn(canvas, 100, 140, Color.black);
this.drawKing(canvas, 375, 50, Color.black);
this.drawRook(canvas, 600, 110, Color.black);
this.drawQueen(canvas, 100, 535, Color.black);
this.drawKnight(canvas, 350,480, Color.black);
this.drawBishop(canvas, 700, 480, Color.black);
canvas.drawString("King 1", 10, 10);
canvas.drawString("Rook 1", 10, 30);
canvas.drawString("Queen 1", 10, 20);
canvas.drawString("Pawn " + numPawns, 100, 10);
canvas.drawString("Bishop " + numBishops, 100, 30);
canvas.drawString("Knight 1", 100, 20);
if(numPawns == 1)
{
this.drawPawn(canvas, 100, 140, Color.black);
}
else if(numPawns == 2)
{
this.drawPawn(canvas, 100, 140, Color.black);
this.drawPawn(canvas, 800, 800, Color.black);
}
else if(numPawns == 3)
{
}
else if(numPawns == 4)
{
}
else
{
}
if(numBishops == 1)
{
this.drawBishop(canvas, 100, 140, Color.cyan);
}
else if(numPawns == 2)
{
this.drawBishop(canvas, 100, 140, Color.black);
}
else if(numBishops == 3)
{
}
else if(numBishops == 4)
{
}
else
{
}
}
public void drawPawn(Graphics canvas, int x, int y, Color pawnColor)
{
canvas.setColor(pawnColor);
canvas.fillOval(x-10, y-45, 120, 120);//top oval
canvas.fillRect(x+0, y+50, 100, 150);//middle rect
canvas.fillRoundRect(x-35, y+200, 170, 70, 10, 10);//base rect
canvas.setColor(Color.white);
canvas.fillOval(x-25 , y+75, 50, 125);//oval out of middle
canvas.fillOval(x+75, y+75, 50, 125);//oval out of middle
}
public void drawKing(Graphics canvas, int x, int y, Color kingColor)
{
canvas.setColor(kingColor);
canvas.setColor(Color.black);
canvas.fillRect(x-60, y+180, 210, 120);//seconds rect from the bottom
canvas.setColor(Color.white);
canvas.fillOval(x-90, y+165, 60, 120);//ovals out of second from bot
canvas.fillOval(x+120, y+165, 60, 120);//ovals out of second from bot
canvas.setColor(Color.black);
canvas.fillRoundRect(x-90, y+300, 270, 60, 10, 10);//base rect
canvas.fillRect(x+30, y-0 , 30, 90);//cross rect
canvas.fillRect(x+0, y+30, 90, 30);//cross rect
canvas.fillRect(x-15, y+90, 120, 60);//first rect from top
canvas.fillRect(x-15, y+150, 120, 30);//first rect from top
canvas.setColor(Color.white);
canvas.fillOval(x-30, y+30, 30, 120);//oval out of top rect
canvas.fillOval(x+90, y+30, 30, 120);//oval out of top rect
canvas.setColor(Color.black);
}
public void drawRook(Graphics canvas, int x, int y, Color rookColor)
{
canvas.setColor(rookColor);
canvas.setColor(Color.black);
canvas.fillRect(x+15, y+90, 150, 180);//middle rect
canvas.setColor(Color.white);
canvas.fillOval(x-30, y+30, 60, 240);//ovals on side of bottom rect
canvas.fillOval(x+150, y+30, 60, 240);//ovals on bottom of rect
canvas.setColor(Color.black);
canvas.fillRoundRect(x+0, y+0, 180, 90, 20, 20);//top rec
canvas.fillRoundRect(x+0, y+240, 180, 60, 10, 10);//base rectangle
canvas.setColor(Color.white);
canvas.fillRect(x+40, y+0, 15, 30);//next 3 lines are slits in top
canvas.fillRect(x+80, y+0, 15, 30);
canvas.fillRect(x+120, y+0, 15, 30);
}
public void drawQueen(Graphics canvas, int x, int y, Color queenColor)
{
canvas.setColor(queenColor);
canvas.setColor(Color.black);
canvas.fillRect(x+0, y+0, 150, 240); //main body rectangle
canvas.fillOval(x-30, y+180, 60, 60);//circles added to base
canvas.fillOval(x+120, y+180, 60, 60);//circles added to base
canvas.fillOval(x+55, y-45, 40, 40);//circle on top
canvas.setColor(Color.white);
canvas.fillOval(x-45, y-30, 90, 210);//ovals out of middle rect
canvas.fillOval(x+105, y-30, 90, 210);//ovals out of middle rect
canvas.setColor(Color.black);
canvas.fillRoundRect(x+30, y+60, 90, 30, 10, 10);//rect in middle of body
}
public void drawKnight(Graphics canvas, int x, int y, Color knightColor)
{
canvas.setColor(Color.black);
Polygon tri = new Polygon();
tri.addPoint(x+0, y+75);
tri.addPoint(x+210, y+75);
tri.addPoint(x+105, y+165);
canvas.fillPolygon(tri);
canvas.fillRoundRect(x-0, y+240, 210, 60, 10, 10);//base rectangle
canvas.fillOval(x+30, y+130, 60, 120);//left oval
canvas.fillOval(x+120, y+130, 60, 120);//right oval
canvas.setColor(Color.white);
canvas.fillOval(x+100, y+105, 15, 15);
canvas.fillOval(x+100, y+135, 15, 15);
}
public void drawBishop(Graphics canvas, int x, int y, Color bishopColor)
{
canvas.setColor(Color.black);
canvas.fillOval(x+0, y+0, 90, 90);//head
canvas.fillRoundRect(x-30, y+90, 150, 30, 15, 15);//shoulders
canvas.fillRect(x-30, y+120, 150, 120);//body
canvas.fillOval(x+30, y-30, 30, 30);
canvas.setColor(Color.white);
canvas.fillOval(x-75, y+120 , 90, 120);//ovals out of body
canvas.fillOval(x+75, y+120 , 90, 120);//ovals out of body
canvas.fillRect(x+20, y+0, 15, 50);//slit out of head
canvas.setColor(Color.black);
canvas.fillRoundRect(x-60, y+240, 210, 60, 10, 10);//base rect
}
}
真棒。非常感謝你 – user7538286