达内科技JAVA面试笔试.docVIP

选择题 1:下面关于变量及其范围的陈述哪些是错的。 A.实例变量是类的成员变量。 B.实例变量用关键字static声明。 C.在方法中定义的局部变量在该方法被执行时创建 D.局部变量在使用前必须被初始化。 2: What?will?be?printed?when?you?execute?the?following?code?? ?? ?? class?X? ?? { ?? ??Y?b?=?new?Y(); ?? ??X()? ?? ?{? ?? ???System.out.print(X);? ?? ??} ?? }? ?? ?? class?Y? ?? { ?? ????Y()? ?? ???{? ?? ?????System.out.print(Y);? ?? ???} ?? }? ?? ?? public?class?Z?extends?X? ?? { ?? ???Y?y?=?new?Y();? ?? ??Z()? ?? ?{? ?? ????System.out.print(Z);? ?? ??}? ?? ???public?static?void?main(String[]?args)? ?? ??{ ?? ???????????????new?Z(); ?? ??} ?? }? ?? ?? Choices:?? What will be printed when you execute the following code? class X { Y b = new Y(); X() { System.out.print(X); } } class Y { Y() { System.out.print(Y); } } public class Z extends X { Y y = new Y(); Z() { System.out.print(Z); } public static void main(String[] args) { new Z(); } } Choices: A.Z B.YZ C.XYZ D.YXYZ 3: Give?the?code?fragment: ?? if(x4){ ?? System.out.println(“Test?1”);} ?? else?if?(x9){ ?? System.out.println(“Test?2”);} ?? else?{ ?? System.out.println(“Test?3”);} ?? Which?range?of?value?x?would?produce?of?output?“Test?2”???? Give the code fragment: if(x4){ System.out.println(“Test 1”);} else if (x9){ System.out.println(“Test 2”);} else { System.out.println(“Test 3”);} Which range of value x would produce of output “Test 2”? A.x4 B.x4 C.x9 D.None 4:Which declares for native method in a java class corrected? A.public native void method(){} B.public native void method(); C.public native method(); D.public void native method(); 5:使用 JDBC 可以做到的是 A.把二进制代码传送到任何关系数据库中 B.把 Java 源代码传送到任何关系数据库中 C.把表单信息传送到任何关系数据库中 D.很容易地把 SQL 语句传送到任何关系数据库中 6:鉴于Java的特点，它最适合的计算环境是 A.并行计算环境 B.分布式计算环境 C.高强度计算环境 D.开放式计算环境 7:在下述选项时,没有构成死循环的程序是 A.int i=100 while (1) { i=i%100+1; if (i100) break; } B.for (;;); C.int k=1000; do { ++k; }while(k=10000); D.int s=36; while (s);--s; 8:What is written to the standard o