Java程序设计基础例题1////定义app2_1类3{4publicstaticvoidmain(String[]args)//定义主方法5{("HelloJava!");7}8}1//.*;//.*;////定义类App2_2,其父类为Applet5{6publicvoidpaint(Graphicsg)7{("HelloJava!",50,50);9}10}<><html><APPLETcode=""width="200"height="120"alt="很抱歉,您的浏览器不支持Javaapplet。"></APPLET></html>1////定义类app3_13{4publicstaticvoidmain(String[]args)5{6inta=155;7floatb=;("a="+a+",b="+b);//输出a,("a/b="+(a/b));//输出a/b的值10}11}1//{4publicstaticvoidmain(String[]args)5{6inta=155;7intb=9;8floatg,h;("a="+a+",b="+b);//输出a,b的值10g=a/b;//("a/b="+g+"\n");//("a="+a+",b="+b);//输出a,b的值13h=(float)a/b;//("a/b="+h);//输出h的值15}16}1//.*;//{5publicstaticvoidmain(String[]args)throwsIOException6{7BufferedReaderbuf;8Stringstr;9buf=newBufferedReader(newInputStreamReader());("请输入字符串;");11str=();//("您输入的字符串是:"+str);//输出字符串13}14}1//.*;lassapp3_44{5publicstaticvoidmain(String[]args)throwsIOException6{7floatnum;8Stringstr;9BufferedReaderbuf;10buf=newBufferedReader(newInputStreamReader());("请输入一个实数:");12str=();//将输入的文字指定给字符串变量str存放13num=(str);//("您输入的数为:"+num);15}16}1//.*;lassapp3_54{5publicstaticvoidmain(String[]args)throwsIOException6{7intnum1,num2;8Stringstr1,str2;9InputStreamReaderin;10in=newInputStreamReader();11BufferedReaderbuf;12buf=newBufferedReader(in);("请输入第一个数:");14str1=();//将输入的内容赋值给字符串变量str115num1=(str1);//将str1转成
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