我正在練習一些面試問題,但不知道如何比較hashMap值.前提是您有一本帶弦的雜志.您必須從雜志中切出適當數量的字符以形成贖金字樣.我已經設法將字符和字符的出現次數添加到hashMap中,但是如何比較兩個hashMap以確定我有足夠的字母.任何指導都將不勝感激.

雜志= {g = 2,= 14,d = 2,e = 2,a = 4,n = 1,o = 5,l = 4,m = 1,.= 1,k = 1,I = 2, h = 2,i = 6,w = 1,T = 1,u = 1,t = 2,s = 3,r = 1,y = 2}

贖金= {w = 1,= 3,o = 1,l = 4,k = 1,I = 1,y = 1,i = 2}

String mag = "this is what I said Im going to do. i really like you a lot";

String ransom = "i will kill you";

Map map = new HashMap();

Map ransomMap = new HashMap();

for(int i = 0; i < mag.length() -1; i++)

{

char c = mag.charAt(i);

if(!map.containsKey(c))

map.put(c, 1);

else{

int value = map.get(c);

map.put(c,++value);

}

}

System.out.println(map);

for(int i = 0; i < ransom.length()-1; i++ )

{

char c = ransom.charAt(i);

if(!ransomMap.containsKey(c))

ransomMap.put(c,1);

else

{

int value = (ransomMap.get(c));

ransomMap.put(c,++value);

}

}

System.out.println(ransomMap);

}

總結

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