如何使此測試通過？

Question

我將如何讓一個while循環遍歷字符串的字符來找到第一個空格並返回該位置的值。我是否需要在while循環中使用雙重條件？

public class TestSentenceCounter 
{ 
private static final String SENTENCE1 = "This is my sentence."; 
private static final String SENTENCE2 = "These words make another sentence that is longer"; 
private SentenceCounter sc1; 
private SentenceCounter sc2; 

/** 
* Create two instances we can play with 
*/ 
@Before 
public void setup() 
{ 
    sc1 = new SentenceCounter(SENTENCE1); 
    sc2 = new SentenceCounter(SENTENCE2); 
} 
/** 
* Make sure the instance variable is correct 
*/ 
@Test 
public void testConstructor() 
{ 
    assertEquals(SENTENCE1, sc1.getSentence()); 
    assertEquals(SENTENCE2, sc2.getSentence()); 
} 
@Test 
public void testFirstBlankPosition() 
{ 
    assertEquals(4, sc1.firstBlankPosition()); 
    assertEquals(5, sc2.firstBlankPosition()); 
} 
} 
---------------------------------------------------- 
public class SentenceCounter 
{ 
public String sentence; 

public SentenceCounter(String sentence) 
{ 
    this.sentence = sentence; 
} 

public Object getSentence() 
{ 

    return sentence; 
} 
public Object firstBlankPosition() 
{ 


    return null; 
} 
} 

Answer 1

更新代碼，因此，

public int firstBlankPosition() 
{ 

     int returnVal = 0; 
     char ch ; 
      for(int i = 0 ; i < sentence.length() ; i++){ 
       ch = sentence.charAt(i); 

       if(ch == ' '){ 
        returnVal = i; 
        break; 
       } 
      } 

    return returnVal; 
}