java程序复习题_免费下载

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1、1.//程序China.java:publicclassChina{publicstaticvoidmain(String[]args){manzhangsan=newman();zhangsan.say();}}classman{voidsay(){System.out.println("")}}2//CopyFile.javaimportjava.io.*;classCopyFile{publicstaticvoidmain(String[]args)throwsIOException{inti;FileInputStreamfin;FileOutputStreamfout;fin=n

2、ewFileInputStream("myfile.txt");fout=newFileOutputStream("yourfile.txt");Do{i=fin.read();if(i!=-1)fout.write(i);}while(i!=-1);fin.close();fout.close();System.out.println("myfile.txt内容已被复制到yourfile.txt文件中");}}3.classA{voidf(){intu=(int)(Math.random()*100);intv=0,p;if(u>50){v=9;}p=v+u;}}4.//App.java

3、classPerson{privateStringname;privateintage;//定义一个私有整型属性agepublicPerson(Stringname,intage){this.name=name;this.age=age;}publicvoidshow(){System.out.println("姓名："+name+"年龄"+age);}}publicclassApp{publicstaticvoidmain(String[]args){Person[]per;per=newPerson[1];per[0]=newPerson("张三",19);per[0].show();

4、}}5.//App.javaclassPerson{Stringname;privateintage;//定义一个私有整型属性agepublicintgetAge(){returnage;//返回age属性}publicvoidsetAge(intage){if(age>=5&&age<=20)//如果5≤newAge≤20，则将newAge赋值给age属性并返回true；否则返回false{this.age=age;}elseSystem.out.println("您的数据有错误!");}}publicclassApp1{publicstaticvoidmain(String[]args

5、){Persons1;s1=newPerson();s1.name="张三";s1.setAge(25);;System.out.println("你好，我叫"+s1.name+"，"+"我今年"+s1.setAge()+"岁");}}6.classperson{Stringname;privateintage;publicintgetAge(){returnage;}publicintsetAge(intage){if(age>=5&&age<=20){this.age=age;}elseSystem.out.println("你输入的数据有错误!");returnage;}}publi

6、cclassApp2{publicstaticvoidmain(String[]args){persons1;s1=newperson();s1.setAge(19);s1.name="张三";if(s1.getAge()>=5&&s1.getAge()<=20)System.out.println(s1.name+"的年龄是："+s1.getAge());elseSystem.out.println("年龄错误");}}7.publicclassApp9_1{publicstaticvoidmain(String[]args){inti;int[]a={1,2,3,4};for(i=0;

7、i<5;i++)System.out.println("a["+i+"]="+a[i]);System.out.println("5/0"+(5/0));}}8.publicclassApp9_2{publicstaticvoidmain(String[]args){inti;int[]a={1,2,3,4};for(i=0;i<5;i++){try{System.out.println("a["+i+"]="+a[i]