class Block{
{//代码1
System.out.println("1");
}
static{//代码2
System.out.println("2");
}
{//代码3
System.out.println("3");
}
public Block()
{//代码4
System.out.println("4");
}
}
举一反三
- 中国大学MOOC: 下列代码中构造方法的返回类型是()public class Village { Village () { System .out .println(“hiding in Village”) ; } public static void main( String args [ ]) { Village c =new Village ( ) ;}class Village { public static void main( String args [ ]) { Village c =new Village ( ) ; } Village () { System .out .println(“hiding in Village”) ; } }
- public class E4_1{ public static void main(String args[]) { int a = 1; int b = 2; int c = 3; a += 5; b *= 4; c += a * b; c %= 6; System.out.println("a = " + a); //代码1 System.out.println("b = " + b); //代码2 System.out.println("c = " + c); //代码3 }}运行结果,代码1______ ,代码2______ ,代码3______ 。
- 请看下面的程序代码,当 n 为( )值时,程序段将输出字符串 second。 [br][/br] switch(n) { [br][/br] case 0: System .out .println(“first”); [br][/br] case 1: [br][/br] case 2: System .out .println(“second”); break; [br][/br] default: System .out .println(“end”); [br][/br] }(2.0) A: 0 B: 1 C: 2 D: 以上都可以
- 【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
- (6-7)下面()代码段属于普通代码块。 classBlock{ {//代码1 System.out.print("1"); } static{//代码2 System.out.print("2"); } {//代码3 System.out.print("3"); } publicBlock() {//代码4 System.out.print("4"); } staticvoidshow() {//代码5 System.out.print("5"); } static{//代码6 System.out.print("6"); } }
内容
- 0
定义类Block和类Demo,运行Demo的输出结果是。 class Block{ {//代码1 System.out.print("1"); } static{//代码2 System.out.print("2"); } {//代码3 System.out.print("3"); } public Block() {//代码4 System.out.print("4"); } static void show() {//代码5 System.out.print("5"); } static {//代码6 System.out.print("6"); } } //定义测试类Demo public class Demo { public static void main(String[] args) { new Block().show(); new Block() } }
- 1
阅读以下程序,请写出代码1和代码2的运行结果 public class App3_1{ public static void main(String args[]) { int a=155; float b=20.0f; System.out.println("a="+a+",b="+b); //代码1 System.out.println("a/b="+(a/b)); //代码2 } }
- 2
研究下面的Java代码: switch (x) { case 1: System.out.println(1); case 2: case 3: System.out.println(3); case 4: System.out.println(4); } 当x=2时,运行结果是()
- 3
(6-2)以下代码会出现编译错误。 class Base{ public Base () { System.out.println("1"); } public void Base () { System.out.println("2"); } }
- 4
阅读下面代码: public class Test2005 { public static void main(String args[]) { System.out.println((3>2) 4:5); } } 其运行结果是 A: 2 B: 3 C: 4 D: 5