JAVA基础知识测试题2

1、1、给定下列代码：01. public class Mud 02.入代码位置03. System.out.println("hi");04. 05. 下述有5个片段代码：public static void main( Stri ng.a) (Stri ng a,Stri ng b,Strhi ng c, )public static void main(String.* a) public static void main(String. a) public static void main(String. a) public static void main(Strin

2、g. a) 将上述代码插入第二行时，有几个可以编译通过？A. 0B. 1C. 2D. 3E. 4F. 52、已知下述代码 public class TestStri ng1 public static void main(String args) Stri ng str = "420"str += 42;System.out.pri nt(str);请问输出了什么？A. 42B. 420C. 462E. 编译错误F. 可以编译通过，但是会出现运行(run time )错误3、public void go() Stri ng o =""z:for(int

3、x = 0; x < 3; x+) for(i nt y = 0; y < 2; y+) x=0 y=0 o=” 00 ”x=0 y=1 o=” 0001x=1 不执行，x=2 y=0 000120 if(x=1) break;if(x=2 && y=1) break 乙 o = o + x + y; 0002System.out.pri ntl n( o);当调用上述代码段中的go()方法时会发生什么？A. 00B. 0001C. 000120D. 00012021E. 编译错误F. 可以编译通过，但是会出现运行(run time )错误4、给定下述代码：int

4、x = 0;int y = 10;do y-;+x; while (x < 5);System.out.pri nt(x + "," + y);输出了什么？A. 5,6B. 5,5C. 6,5D. 6,65、请问下述代码是如何输出的？（请把输出写在题下空白处）public class Foo /in sta nee variable in itializerStri ng s = "abe"/con struetorpublic Foo() System.out.pri ntln ("c on structor called")

5、;/static in itializerstatic System.out.pri ntl n("static in itializer called");/instance initializerclass innereSystem.out.println("instance initializer called");public static void main(String args) System .out.println(This is main callingnew Foo();new Foo();输出结果:static in itializer calledThis is main calling!in sta nee in itializer called con structor called in sta nee in itializer called con structor called6、下面哪种类型可以填写在空白处?pi = 3.14f;A. byteB. floatC. doubleD. short7、给定下述代码public class Yippee public static void main( Stri ng args)