嗨,我正在学习 Java,并找到了一个非常简洁的解决方案,但我对第二个 for 循环中的特定代码行感兴趣。我不知道该问谁,因为我还没有在学校学习 Java,所以我在这里问,但无论如何:
for (int i = 0; i < BRICKS_IN_BASE + (-h); i++)
这是否意味着将“重复i
此次数”添加到“h
负 1”?更具体地说是什么(-h)
?是前置增量吗?为什么它在括号中?
它再次用于声明变量x
。
import acm.graphics.*;
import acm.program.*;
import java.awt.*;
public class Pyramid extends GraphicsProgram {
/** Width of each brick in pixels */
private static final int BRICK_WIDTH = 30;
/** Width of each brick in pixels */
private static final int BRICK_HEIGHT = 12;
/** Number of bricks in the base of the pyramid */
private static final int BRICKS_IN_BASE = 15;
public void run() {
for (int h = 0; h < BRICKS_IN_BASE; h++)
{
for (int i = 0; i < BRICKS_IN_BASE + (-h); i++)
{
int k = i * BRICK_WIDTH;
int m = h * BRICK_HEIGHT;
int x = ((getWidth() - ((BRICKS_IN_BASE + (-h)) * BRICK_WIDTH)) / 2) + k;
int y = getHeight() - ((BRICK_HEIGHT + 1) + m);
GRect brick = new GRect (x, y, BRICK_WIDTH, BRICK_HEIGHT);
add(brick);
}
}
}
}