JAVA基礎(chǔ)知識(shí)測(cè)試題2

1、1、給定下列代碼：01. public class Mud 02.入代碼位置03. System.out.println("hi");04. 05. 下述有5個(gè)片段代碼：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) 將上述代碼插入第二行時(shí)，有幾個(gè)可以編譯通過？A. 0B. 1C. 2D. 3E. 4F. 52、已知下述代碼 public class TestStri ng1 public static void main(String args) Stri ng str = "420"str += 42;System.out.pri nt(str);請(qǐng)問輸出了什么？A. 42B. 420C. 462E. 編譯錯(cuò)誤F. 可以編譯通過，但是會(huì)出現(xiàn)運(yùn)行(run time )錯(cuò)誤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 不執(zhí)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);當(dāng)調(diào)用上述代碼段中的go()方法時(shí)會(huì)發(fā)生什么？A. 00B. 0001C. 000120D. 00012021E. 編譯錯(cuò)誤F. 可以編譯通過，但是會(huì)出現(xiàn)運(yùn)行(run time )錯(cuò)誤4、給定下述代碼：int

4、x = 0;int y = 10;do y-;+x; while (x < 5);System.out.pri nt(x + "," + y);輸出了什么？A. 5,6B. 5,5C. 6,5D. 6,65、請(qǐng)問下述代碼是如何輸出的？（請(qǐng)把輸出寫在題下空白處）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();輸出結(jié)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、下面哪種類型可以填寫在空白處?pi = 3.14f;A. byteB. floatC. doubleD. short7、給定下述代碼public class Yippee public static void main( Stri ng args)