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1、补充第一节的内容publicclassMyJavaClass{inta;myjavaclass(inta){this.a=a;}publicvoidmain(){myjavaclassc1=newMyJavaClass();System.out.printIn(c1.a);}System.out.printIn("程序结束。");}1.上面的程序有几处错误？请依次改正。2.这个程序的源代码应该保存为什么名字的文件？3.请写出编译和运行这个文件的完整命令，注意给出环境变量的设置（假设源文件保存在d:java目录）4.如果在程序最前面加入下面语句：packag
2、ePkg;该程序又该如何编译和运行？答案：答案（1）：修改以后的程序为（粗体为修改过的地方）publicclassMyJavaClass{inta;MyJavaClass(inta){this.a=a;}publicStaticvoidmain(Stringargs[]){MyJavaClassc1=newMyJavaClass(2)//此处的实际参数可为任意整数;System.out.println(c1.a);System.out.println("程序结束。");}}答案（2）publicclassMyJavaClass{inta;intmyjavaC
3、lass(inta){this.a=a;returna;}//注此处函数返回值可为任意类型publicstaticvoidmain(Stringargs[]){MyJavaClassc1=newMyJavaClass();System.out.println(c1.a)；System.out.println("程序结束。");}}2、答案：这个程序的源代码应该保存为MyJavaClass.java。3、答案(1)setclass=c:j2sdkbinsetclasspath=d:java编译：javacd:javaMyJavaClass.java运
4、行：javaMyJavaClass答案（2）编译：c:j2sdkbinjavacd:javaMyJavaClass.javasetclasspath=d:java运行：javaMyJavaClass4、答案：如果在程序最前面加入语句：packagepkg;环境变量同3、设置编译：javac-d.d:javaMyJavaClass.java运行：javapkg.MyJavaClassI实验1答案1-(1-1)：importjava.io.*;classRandomMonth{publicstaticvoidmain(Stringargs[]){
5、Stringmonths[]={"January","February","March","April","May","June","July","Aguest","September","October","November","December"};inti;i=(int)(Math.random()*12);System.out.println(months[i]);}}1-(1-2)：importjava.io.*;importjava.util.*;classRandomMonth2{publicstaticvoidmain(Stringargs[
6、]){Stringmonths[]={"January","February","March","April","May","June","July","Aguest","September","October","November","December"};Randomr=newRandom();inti;i=Math.abs(r.nextInt())%12;System.out.println(months[i]);}}1-(2)importjava.util.*;classRandomPx{publicstaticvoidmain(Stringargs
7、[]){intnum[]=newint[20];inti,j,temp;Randomr=newRandom();for(i=0;i<20;i++)num[i]=r.nextInt();for(i=0;i<19;i++)for(j=0;j<19-i;j++){if(num[j]>num[j+1]){temp=num[j];num[j]=num[j+1];num[j+1]=temp;}}for(i=0;i<20;i++){if(i%5==0)System.out.print("r");System.out.print(num[i]+"");}}}II实验2
8、答案2-(1)publicclassstudentx
