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895天前1.Main类 |
package s0223容器分拣存储; |
import java.util.HashMap; |
import java.util.Map; |
public class Main { |
public static void main(String[] args) { |
String str = "this is a cat and that is a dog"; |
String[] arry = str.split(" "); |
Map<String, Letter> letters = new HashMap<String, Letter>(); |
|
|
// 未优化代码 |
// for (String temp : arry) { |
// if (!letters.containsKey(temp))// HashMap.containsKey() 判断map中是否有这个键 |
// { |
// letters.put(temp, new Letter()); |
// |
// } else { |
// Letter col = letters.get(temp);// 根据key,返回value |
// col.setCount(col.getCount() + 1); |
// } |
// } |
|
//优化代码*********************************************************************************** |
Letter col=null; |
for (String temp : arry) { |
if (null==(col=letters.get(temp)))// HashMap.containsKey() 判断map中是否有这个键 |
{ |
letters.put(temp, new Letter()); |
} else { |
col.setCount(col.getCount() + 1); |
} |
} |
//优化代码*********************************************************************************** |
|
letters.keySet().forEach( |
(element) -> System.out.println("字母" + element + " 次数:"+ letters.get(element).getCount()) |
); |
} |
} |
2.Letter类 |
package s0223容器分拣存储; |
public class Letter { |
private String name; |
private int count; |
|
public Letter() |
{} |
public Letter(String name, int count) { |
this.name = name; |
this.count = count; |
} |
public String getName() { |
return name; |
} |
public void setName(String name) { |
this.name = name; |
} |
public int getCount() { |
return count; |
} |
public void setCount(int count) { |
this.count = count; |
} |
} |
