如何将变量分配给条件if语句中的值

Question

public String simpleConditional(int price)  {
String answer = null ;
price = 20;
if (price < 20)
System.out.println("Buying new shirt");
answer = "Buying new shirt"

ConditionalStatementsTest > simpleConditionalTest(int, String) > com.ata.ConditionalStatements
Test.simpleConditionalTest(int, String)[3] FAILED                                             
org.opentest4j.AssertionFailedError: expected: <null> but was: <Buying new shirt>         
at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)                  
at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)          
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)             
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)             
at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1124)                
at com.ata.ConditionalStatementsTest.simpleConditionalTest(ConditionalStatementsTest.j

我正试图与"；回答"；变量为"；购买新衬衫"价值这就是我收到的断言错误代码和上面提到的代码。我该如何解决解决这个错误，在我看来是正确的。(这是一个家庭作业检查器程序(

Answer 1

从代码片段中可以清楚地看出，返回类型是"字符串"所以如果你想返回"；买新衬衫"。

public String simpleConditional(int price) {
String answer = null;
price = 20;
if(price < 20) {
System.out.println("Buy new shirt");
answer = "buy new shirt";
return answer;       
} else {
return "Something else"; 
}
}

Answer 2

它可能是这样的：

/**
* Assumes the monetary value supplied is a floating point value.
* 
* @param price (double) Will return null if 0 or less is supplied.
* 
* @return (String)
*/
public static String simpleConditional(double price) {
String answer = null;
if (price > 0d && price < 20d) {
System.out.println("Buy new shirt");
answer = "buy new shirt";
}
else if (price >= 20d && price < 80d) {
answer = "Hmmm...buying a decent shirt!";
}
else if (price >= 80d) {
answer = "Wow...Big Spender, buying a really good shirt!";
}
return answer;
}

要在类main()方法中使用名为simpleConditional()方法的方法，可以执行以下操作：

public static void main(String args[]) {
String anAnswer = simpleConditional(56.98);
System.out.println(anAnswer);
// The following will work to:
System.out.println(simpleConditional(104));
}