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null 之AddAll、Add和Boolean

@Test
//failed
public void TestListAddAll(){
List<TravelerInfo> travelerInfoSummary=new ArrayList<TravelerInfo>();
travelerInfoSummary.addAll(null);
}
@Test
//success
public void TestListAdd(){
List<TravelerInfo> travelerInfoSummary=new ArrayList<TravelerInfo>();
travelerInfoSummary.add(null);
}

 

总结null在List中不能addAll,但可以Add

 

另外,bool型是可以用null赋值的

见:

import org.junit.Test;

public class Tests {
private String name;
private Boolean isMe;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Boolean getIsMe() {
return isMe;
}
public void setIsMe(Boolean isMe) {
this.isMe = isMe;
}

@Test
//success
public void tests(){
Tests t=new Tests();
t.setIsMe(null);
}

}

null 之AddAll、Add和Boolean