////定义app2_1类{publicstaticvoidmain(String[]args)//定义主方法{("HelloJava!");}}//.*;//.*;////定义类App2_2,其父类为Applet{publicvoidpaint(Graphicsg){("HelloJava!",50,50);}}<><html><APPLETcode=""width="200"height="120"alt="很抱歉,您的浏览器不支持Javaapplet。"></APPLET></html>////定义类app3_1{publicstaticvoidmain(String[]args){ inta=155; floatb=; ("a="+a+",b="+b);//输出a,b的值 ("a/b="+(a/b));//输出a/b的值}}//{publicstaticvoidmain(String[]args){inta=155; intb=9; floatg,h; ("a="+a+",b="+b);//输出a,b的值 g=a/b;//将a除以b的结果放在g中 ("a/b="+g+"\n");//输出g的值 ("a="+a+",b="+b);//输出a,b的值 h=(float)a/b;//("a/b="+h);//输出h的值}}//.*;//{publicstaticvoidmain(String[]args)throwsIOException{BufferedReaderbuf;Stringstr;buf=newBufferedReader(newInputStreamReader());("请输入字符串;");str=();//("您输入的字符串是:"+str);//输出字符串}}//.*;lassapp3_4{publicstaticvoidmain(String[]args)throwsIOException{floatnum;Stringstr;BufferedReaderbuf;buf=newBufferedReader(newInputStreamReader());("请输入一个实数:");str=();//将输入的文字指定给字符串变量str存放num=(str);//("您输入的数为:"+num);}}//.*;lassapp3_5{publicstaticvoidmain(String[]args)throwsIOException{intnum1,num2;Stringstr1,str2;InputStreamReaderin;in=newInputStreamReader();BufferedReaderbuf;buf=newBufferedReader(in);("请输入第一个数:");str1=();//将输入的内容赋值给字符串变量str1num1=(str1);//("请输入第二个数:");str2=();//将输入的内容赋值给字符串变量str2num2=(str2);//将
java程序代码 来自淘豆网m.daumloan.com转载请标明出处.
