北京语言大学20春《Java语言程序设计》作业1答案

A．浮点型

B．整型

C．数组型

D．字符型

[]){ char c1,c2,c3; c1='H'; c2='\\'; c3='\115'; System.out.print(c1); System.out.print(c2); System.out.print(c3);
A.无输出
B.H\\\115
C.H\M
D.H115

rgs[]){ int x,y; x=(int)82.5; y=(int)'A'; System.out.print("x="+x); System.out.print("\ty="+y); } }
A.82 A
B.82 65
C.82.5 A
D.82.5 65

quot;There is none parameter."); } void printMeth(String t){ System.out.println("There is one parameter."); } void printMe
A.There is one parameter.There is none parameter.There are two parameters.
B.There is none parameter.There is one parameter.There are two parameters.
C.There is none parameter.It’s good!There are tw
D.It’s good!There is none parameter.There are two parameters.

){ int x,y; x=(int)Math.sqrt(5)/2+(int)Math.random()*5/2; y=(int)Math.sqrt(3)/2+(int)Math.random()*3/2; if(x＞y) System.out.println("x＞y");
A.编译错误
B.x＞y
C.x=y
D.x

a[]={1,2,3},b[]=new int [3]; System.arraycopy(a, 0, b, 0, 3); System.out.println("a[0]="+a[0]+" b[0]="+b[0]); a[0]=10; System.out.println("a
A.a[0]=1 b[0]=1 a[0]=10 b[0]=1
B.a[0]=1 b[0]=10 a[0]=1 b[0]=10
C.a[0]=10 b[0]=1 a[0]=10 b[0]=1
D.a[0]=10 b[0]=10 a[0]=1 b[0]=1

A.String A=“firstJava”;A-=“Java”
B.String A=“firstJava”;A+=“Java”
C.Integer J=new Integer(27);J-=7
D.Integer J=new Integer(27);J--

A．javax.sound

B．javax.rmi

C．javax.naming

D．java.math

A．源文件不在当前目录下

B．没有import相应的包

C．未加.java后缀

D．文件名拼写错误

ew RuntimeException(); } public static void main(String args[]){ try{ System.out.println("你好吗"); throwit(); System.out.pri
A.输出“你好吗”→输出“结束”→RuntimeException异常发生
B.输出“你好吗”→RuntimeException异常发生→输出“结束”
C.输出“你好吗”→RuntimeException异常发生→输出“出错!”→输出“结束”
D.不能通过编译