单项选择题
public static void main(String[]args){
String str="null";
if(str==null){
System.out.println("null");
}else(str.length()==0){
System.out.println("zero");
}else{
System.out.println("some");
}
}
What is the result?()
A.null
B.zero
C.some
D.Compilationfails.
E.Anexceptionisthrownatruntime.
相关考题
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单项选择题
public static void main(String[]args){ Integer i=new Integer(1)+new Integer(2); switch(i){ case3:System.out.println("three");break; default:System.out.println("other");break; } } Whatistheresult?()
A.three
B.other
C.Anexceptionisthrownatruntime.
D.Compilationfailsbecauseofanerroronline12.
E.Compilationfailsbecauseofanerroronline13.
F.Compilationfailsbecauseofanerroronline15. -
单项选择题
public void testIfA(){ if(testIfB("True")){ System.out.println("True"); }else{ System.out.println("Nottrue"); } } public Boolean testIfB(Stringstr){ return Boolean.valueOf(str); } What is the result when method testIfA is invoked?()
A.True
B.Nottrue
C.Anexceptionisthrownatruntime.
D.Compilationfailsbecauseofanerroratline12.
E.Compilationfailsbecauseofanerroratline19. -
单项选择题
public class ClassA{ public int getValue(){ int value=0; boolean setting=true; String title="Hello"; if(value||(setting && title=="Hello")){return 1;} if(value==1&title.equals("Hello")){return 2;} } } And: ClassA a=new ClassA(); a.getValue(); What is the result?()
A.1
B.2
C.Compilation fails.
D.The code runs with no output.
E.An exception is thrown at runtime.
