【单选题】对于下面代码,正确的Java源程序文件名是( )。 class A { void method1() { System. out .println( "Method1 in class A" ); } } public class B { void method2() { System. out .println( "Method2 in class B" ); } public sta

以下哪个是Java ArrayList 类的方法？ A: add B: println C: import D: System

调用以下类D和E的main() 方法的输出结果为？class D { public static void main(String[] args) { String s1 = new String("hello"); String s2 = new String("hello"); if (s1.equals(s2)) System.out.println("equal"); else System.out.println("not equal"); }} class E { public static void main(String[] args) { StringBuffer sb1 = new StringBuffer("hello"); StringBuffer sb2 = new StringBuffer("hello"); if (sb1.equals(sb2)) System.out.println("equal"); else System.out.println("not equal"); }} A: D: equal; E: equal B: D: not equal; E: not equal C: D: equal; E: not equal D: D: not equal; E: equal

阅读下面的代码段，屏幕的输出是什么？public static void main(String[] args) { try{tryThis();return;}catch(IOException x1){ System.out.println("exception 1");return;}catch(Exception x2){System.out.println("exception 2");return;}finally{ System.out.println("finally");} } static void tryThis() throws IOException{ throw new IOException(); } A: ”exception1”后面跟着”finally” B: ” exception2”后面跟着“finally” C: ”exception1” D: ”exception2”

（9-2）下面程序能够通过编译检查。 public class Demo5 { public static void main(String[] args) { try { System.out.println(3/0); System.out.println("你好"); }catch(Exception e) { e.printStackTrace(); }catch(ArithmeticException e) { e.printStackTrace(); } } }