publicclassDemo{publicstaticvoidmain(String[]args){Listal=newArrayList();al.add(1”);al.add(2”);al.add(2”);al.add(3”);System.out.println(al);}}上述程序执行后的输出是哪项?()

有如下的程序:publicclassWelcome3{publicstaticvoidmain(Stringargs[]){System.out.println

对于如下代码 描述正确的是哪项?()classStudent{publicstaticvoidmain(String[]args){Studentstudent=newStudent();}}

对于如下代码 描述正确的是哪项?()classStudent{publicstaticvoidmain(String[]args){Studentstudent=newStudent();}}

下列代码的执行结果是()。publicclasstest5{publicstaticvoidmain(Stringargs[]){Strings1=newStr

现有importjava.io.PrintWriter;classDoFormat{publicstaticvoidmain(String[]args){intx=42;int

现有publicclassDemo{publicstaticvoidmain(String[]args){Listal=newArrayList();a1.add("