题目一：
1. 写一个Java程序，用于分析一个字符串中各个单词出现的频率，并将单词和它出现的频率输出显示。（单词之间用空格隔开，如“Hello World My First Unit Test”）；
2. 编写单元测试进行测试；
3. 用ElcEmma查看代码覆盖率，要求覆盖率达到100%。
代码：
import java.util.HashMap;
import java.util.Iterator;
import java.util.Scanner;
public class Test1 {
private HashMap< String, Integer > dictionary;
private int wordsCount;
public Test1() {
dictionary = new HashMap< String, Integer >();
wordsCount = 0;
}
public void insert( String word ) {
if ( dictionary.containsKey( word ) ) {
int currentCount = dictionary.get( word );
dictionary.put( word, currentCount + 1 );
} else {
dictionary.put( word, 1 );
}
wordsCount++;
}
public int getDifferentWordsNum() {
return dictionary.size();
}
public int getAllWordsNum() {
return wordsCount;
}
public void displayDictionary() {
for ( Iterator< String > it = dictionary.keySet().iterator(); it.hasNext(); ) {
String key = it.next();
System.out.print( key );
System.out.print( ": " );
System.out.println( dictionary.get( key ) );
}
}
public static void main( String[] args ) throws Exception {
String passage = "Hello World My First Unit Test";
Scanner scanner = new Scanner( passage );
Test1 dict = new Test1();
while ( scanner.hasNextLine() ) {
String line =scanner.nextLine();
boolean isBlankLine = line.matches( "\W" ) || line.length() == 0;
if ( isBlankLine ) {
continue;
}
String[] words = line.split( "\W" );
for ( String word : words ) {
if ( word.length() != 0 ) {
dict.insert( word );
}
}
}
dict.displayDictionary();
}
}
