Isa*_*ler 1 java string map coordinates coordinate-systems
我有一个地图,Coords定义如下:
class Coords {
int x;
int y;
public boolean equals(Object o) {
Coords c = (Coords)o;
return c.x==x && c.y==y;
}
public Coords(int x, int y) {
super();
this.x = x;
this.y = y;
}
public int hashCode() {
return new Integer(x+"0"+y);
}
}
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(不是很好,我知道,请不要取笑我.)我现在如何创建一个字符串,从这个地图映射字符,例如:
Map<Coords, Character> map = new HashMap<Coords, Character>();
map.put(new Coords(0,0),'H');
map.put(new Coords(1,0),'e');
map.put(new Coords(2,0),'l');
map.put(new Coords(3,0),'l');
map.put(new Coords(4,0),'o');
map.put(new Coords(6,0),'!');
map put(new Coords(6,1),'!');
somehowTransformToString(map); //Hello !
// !
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谢谢,
Isaac Waller
(注意 - 这不是作业)
创建一个比较器,可以用y和x对Coords进行排序:
int d = c1.y - c2.y;
if (d == 0) d = c1.x - c2.y;
return d;
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TreeMap<Coords, Character> sortedMap = new TreeMap(comparator);
sortedMap.putAll(map); // copy values from other map
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for (Character c: map.values()) System.out.print(c);
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int y = -1;
for (Map.Entry<Coords, Character> e: map.entrySet()) {
if (e.y != y) {
if (y != -1) System.out.println();
y = e.y;
}
System.out.print(c);
}
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