我想阻止我的形状向左或向右移动太远以至于超出屏幕，但我在 KeyHandler 中实现的 outOfBounds 方法收到此错误:
发现 1 个错误: 文件:.../Tetris.java [行:46] 错误:类型 package.Tetromino 未定义方法 outOfBounds(int, int)
这是我的类(class)
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class BigBang extends JComponent implements KeyListener, ActionListener {
Timer timer;
World world;
int score = 0;
JLabel statusbar = new JLabel("Score: " + score);
BigBang(int delay, World world) {
timer = new Timer(delay, this);
this.world = world;
JFrame frame = new JFrame("Tetris");
frame.add(statusbar, BorderLayout.SOUTH);
statusbar.setVisible(true);
frame.getContentPane().add(this );
frame.addKeyListener(this);
frame.setVisible(true);
frame.setSize(Tetris.COLUMNS * Block.SIZE + 27, Tetris.ROWS * Block.SIZE + 60);
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
}
public void start() {
timer.start();
}
BigBang(World world) {
this(1000, world);
}
public void paintComponent(Graphics g) {
world.draw(g);
}
public void actionPerformed(ActionEvent e) {
world.update();
if (world.hasEnded())
timer.stop();
this.repaint();
score += 5;
statusbar.setText("Score: " + score);
}
public void keyPressed(KeyEvent e) {
world.keyPressed(e);
this.repaint();
}
public void keyTyped(KeyEvent e) { }
public void keyReleased(KeyEvent e) { }
}
__
import java.awt.*;
class Block {
final static int SIZE = 20;
int x, y;
Color color;
Block(int x, int y, Color c) {
this.x = x;
this.y = y;
this.color = c;
}
void outOfBounds(int left, int right)
{
if (this.x > right)
this.x = right;
else if (this.x < left)
this.x = left;
}
void draw(Graphics g) {
int xp = this.x * SIZE,
yp = this.y * SIZE;
g.setColor(this.color);
g.fillRect(xp + 85, yp, SIZE, SIZE);
g.setColor(Color.BLACK);
g.drawRect(xp + 85, yp, SIZE, SIZE);
}
void move(int dx, int dy) {
this.x += dx;
this.y += dy;
}
public String toString() {
return "[" + this.x + ", " + this.y + "]";
}
void rotateCW(Point c) {
int newX, newY;
newX = c.x + c.y - this.y;
newY = c.y + this.x - c.x;
this.x = newX;
this.y = newY;
}
boolean equals(Block other) {
return this.x == other.x && this.y == other.y;
}
void setColor(Color c) {
this.color = c;
}
}
class Point {
int x, y;
Point(int x, int y) {
this.x = x;
this.y = y;
}
void move(int dx, int dy) {
this.x += dx;
this.y += dy;
}
public String toString() {
return "(" + this.x + ", " + this.y + ")";
}
}
__
import java.awt.*;
import java.util.*;
class SetOfBlocks extends ArrayList<Block> {
void draw(Graphics g) {
for (Block b : this)
b.draw(g);
}
void move(int dx, int dy) {
for (Block b : this)
b.move(dx, dy);
}
void rotateCW(Point center) {
for (Block b : this)
b.rotateCW(center);
}
boolean contains(Block block) {
if (this.size() != 0)
for (Block b : this)
if (b.equals(block))
return true;
return false;
}
boolean subset(SetOfBlocks blocks) {
if (this.size() != 0)
for (Block b : this)
if (! blocks.contains(b))
return false;
return true;
}
boolean equals(SetOfBlocks blocks) {
return this.subset(blocks) && blocks.subset(this);
}
SetOfBlocks intersect(SetOfBlocks other) {
SetOfBlocks result = new SetOfBlocks();
for (Block b : this)
if (other.contains(b))
result.add(b);
return result;
}
SetOfBlocks union(SetOfBlocks other) {
SetOfBlocks result = new SetOfBlocks();
for (Block b : this)
if (! result.contains(b) )
result.add(b);
for (Block b : other)
if (! result.contains(b) )
result.add(b);
return result;
}
int count() {
return this.size();
}
int maxY() {
int result = 0;
for (Block b : this)
if (b.y > result)
result = b.y;
return result;
}
int minX() {
int result = Tetris.COLUMNS;
for (Block b : this)
if (b.x < result)
result = b.x;
return result;
}
int maxX() {
int result = 0;
for (Block b : this)
if (b.x > result)
result = b.x;
return result;
}
void changeColor(Color color) {
for (Block b : this)
b.setColor(color);
}
boolean overflow() {
for (Block b : this)
if (b.y <= 0)
return true;
return false;
}
SetOfBlocks row(int row) {
SetOfBlocks result = new SetOfBlocks();
for (Block b : this)
if (b.y == Tetris.ROWS - row)
result.add(b);
return result;
}
boolean fullRow(int row) {
int a = this.row(row).count();
int b = Tetris.COLUMNS;
// System.out.println( a + " vs " + b );
return a == b;
}
void eliminateRow(int i) { // i == 0 indicates bottom row
SetOfBlocks row = new SetOfBlocks();
for (Block b : this)
if (b.y == (Tetris.ROWS - i))
row.add(b);
for (Block b : row)
this.remove(b);
for (Block b : this)
if (b.y < (Tetris.ROWS - i))
b.move(0, 1);
}
void eliminateFullRows() {
for (int i = 0; i < Tetris.ROWS; ) {
if (this.fullRow(i)) {
// System.out.println("Eliminating: " + i);
this.eliminateRow(i);
} else i++;
}
}
}
__
import java.awt.*;
import java.awt.event.*;
class Tetris implements World {
static final int ROWS = 20;
static final int COLUMNS = 10;
Tetromino t;
SetOfBlocks blocks;
Tetris(Tetromino t, SetOfBlocks s) {
this.t = t;
this.blocks = s;
}
public void draw(Graphics g) {
t.draw(g);
blocks.draw(g);
g.drawRect(5, 0, Tetris.COLUMNS * Block.SIZE, Tetris.ROWS * Block.SIZE);
for (int i = 0; i < COLUMNS; i++)
g.drawLine((20*i) + 5, 400, (20*i) + 5, 0);
for (int i = 0; i < ROWS; i++)
g.drawLine(5, 20*i, 205, 20*i);
}
public void update() {
if (this.landed())
this.touchdown();
else
this.t.move(0, 1);
}
public boolean hasEnded() { return false; }
public void keyPressed(KeyEvent e) {
if (this.landed())
this.touchdown();
int keycode = e.getKeyCode();
switch (keycode) {
case KeyEvent.VK_LEFT:
{ this.t.move(-1, 0);
this.t.outOfBounds(0, 400);}
break;
case KeyEvent.VK_RIGHT:
{ this.t.move( 1, 0); }
break;
case KeyEvent.VK_DOWN:
{ this.t.move( 0, 1); }
break;
case 'r':
{ this.t.rotateCW(); }
break;
case KeyEvent.VK_SPACE:
{ this.jumpDown(); }
break;
}
}
public static void main(String[] args) {
BigBang game = new BigBang(new Tetris(Tetromino.sQuare(), new SetOfBlocks()));
game.start();
}
public void touchdown() {
this.blocks = this.blocks.union(this.t.blocks);
this.blocks.eliminateFullRows();
this.t = Tetromino.pickRandom();
}
void jumpDown() {
if (! this.landed()) {
this.t.move(0, 1);
this.jumpDown();
}
}
boolean landedOnBlocks() {
this.t.move(0, 1);
if (this.t.overlapsBlocks(this.blocks)) {
this.t.move(0, -1);
return true;
} else {
this.t.move(0, -1);
return false;
}
}
boolean landedOnFloor() {
return this.t.blocks.maxY() == Tetris.ROWS - 1;
}
boolean landed() {
return this.landedOnFloor() || this.landedOnBlocks();
}
}
__
class Tetromino {
static Tetromino sQuare() {
return new Tetromino(new Point(0, -1),
makeBlocks(new int[] {0, -1, 0, -2, 1, -1, 1, -2},
Color.GREEN ));
}
static Tetromino liNe() {
return new Tetromino(new Point(1, -1),
makeBlocks(new int[] {0, -1, 1, -1, 2, -1, 3, -1},
Color.BLUE ));
}
static Tetromino l() {
return new Tetromino(new Point(1, -1),
makeBlocks(new int[] {0, -1, 1, -1, 2, -1, 2, -2},
Color.MAGENTA ));
}
static Tetromino MirroredL() {
return new Tetromino(new Point(1, -1),
makeBlocks(new int[] {0, -1, 1, -1, 2, -1, 0, -2},
Color.CYAN ));
}
static Tetromino t() {
return new Tetromino(new Point(1, -1),
makeBlocks(new int[] {0, -1, 1, -1, 2, -1, 1, -2},
Color.ORANGE ));
}
static Tetromino s() {
return new Tetromino(new Point(1, -1),
makeBlocks(new int[] {0, -1, 1, -1, 1, -2, 2, -2},
Color.RED ));
}
static Tetromino z() {
return new Tetromino(new Point(1, -2),
makeBlocks(new int[] {0, -2, 1, -2, 1, -1, 2, -1},
Color.PINK ));
}
static SetOfBlocks makeBlocks(int[] c, Color color) {
SetOfBlocks a = new SetOfBlocks();
a.add(new Block( c[0], c[1], color));
a.add(new Block( c[2], c[3], color));
a.add(new Block( c[4], c[5], color));
a.add(new Block( c[6], c[7], color));
return a;
}
Point center;
SetOfBlocks blocks;
Tetromino(Point center, SetOfBlocks blocks) {
this.center = center;
this.blocks = blocks;
}
void draw(Graphics g) {
this.blocks.draw(g);
}
void move(int dx, int dy) {
this.center.move(dx, dy);
this.blocks.move(dx, dy);
}
public String toString() {
return this.center + " " + this.blocks ;
}
void rotateCW() {
this.blocks.rotateCW(this.center);
}
boolean overlapsBlocks(SetOfBlocks blocks) {
return this.blocks.intersect(blocks).count() > 0;
}
void changeColor(Color color) {
this.blocks.changeColor(color);
}
static Tetromino pickRandom() {
int value = (int)(Math.random() * 7);
if (value == 0) return Tetromino.sQuare();
else if (value == 1) return Tetromino.liNe();
else if (value == 2) return Tetromino.l();
else if (value == 3) return Tetromino.MirroredL();
else if (value == 4) return Tetromino.t();
else if (value == 5) return Tetromino.s();
else return Tetromino.z();
}
}
__
import java.awt.*;
import java.awt.event.*;
interface World {
public void draw(Graphics g);
public void update();
public boolean hasEnded();
public void keyPressed(KeyEvent e);
}
最佳答案
错误消息告诉您确切的问题:
1 error found: File: .../Tetris.java [line: 46] Error: The method outOfBounds(int, int) is undefined for the type package.Tetromino
当您尝试从 KeyHandler 调用 outOfBounds(int,int) 方法时，无法找到该方法
这是您尝试调用它的 case 语句的片段。
case KeyEvent.VK_LEFT:
{ this.t.move(-1, 0);
this.t.outOfBounds(0, 400);}
break;
您正在对命名不当的 t 变量调用该方法(变量名称应该是描述性的，并且似乎是导致您的问题的部分原因)，该变量是 Tetromino 类类型的变量。您的 Tetromino 类显然没有定义名为 outOfBounds(int, int) 的方法。因此出现错误。
您的 outOfBounds(int, int) 在您的 Blocks 类上明确定义，但作为 私有(private) 方法，意味着只有 Blocks 类自身可以访问它。
关于java - 阻止物体在俄罗斯方 block 游戏中越界，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41110329/