单项选择题
A. equal
B. not equal
C. exception
D. Compilation fails.
单项选择题 public class Test { public static void main(String [] args) { System.out.println(args.length > 4 &&  args[4].equals(“-d”)); } } If the program is invoked using the command line: java Test One Two Three –d What is the result?()
多项选择题 Giventhatbandcrefertoinstancesofwrapperclasses,whichtwostatementsaretrue?()
单项选择题 String a = null; a.concat(“abc”); a.concat(“def”); System.out.println(a); What is the result?()