JAVA实验报告心得

java 20121219 1.0.0 -1 javajdkjavajdk2 javaifswitchcifswitchcjavaccharatjdkcharat(): str.chatat(0)str,str.charat(str.length()-1)3 4 voidreturn5 for(i=0; i<6; i+)ni = aa%10; /aa%10aaaaai aa = (int)aa/10; /aa/10aa6 javatouppercasejdk7 umlpublicprivatestaticjava8 javaumljavaabstract finalfinalextendsab class a extends bpublic int age(int year) int age;int a1 = (int)(time/10000); /int)time/100008int a2 = (int)(year/10000); / age = a2 - a1 +1;/ return age;9 interfaceabstractabstractimplementsclass circle implements shapecircleshape10 10math.random()public static void main(string args) circle cir = new circle(9); square squ = new square(4); shape shape; int r; r = (int)(math.random()*2);/math.random()0.00if(r = 0) shape = cir; else shape = squ; shape.testshape(shape); /1.00,201 11 thread setname()start()thread.currentthread().getname()thread.currentthread().getid()threadthread.currentthread().getpriority()thread12 i/ojavai/o17javajavajavajavajava,javaapplicationappletguijavajavajava1. 2. 3. 4.javajavajava2011/9/10javajava javafor 2012 11 26forforjavafor(123) /1 23windows32jdk1.6eclipse23fortest111 for4ifforfor232 iffor3 switch112for123iffor23forforforjavajava 1. .java.-2010.9javajava webjsp+servlet+javabeanjava web1. 2. 3. 4. j2semyeclipse 8.54303 1. 5. 6. case 5 212for(int f=0;f<4;f+)public void zihao()font f=new font(,font.plain,20);jta.setfont(f);public void ziti()font f=new font(,font.plain,15);public void font()jcolorchooser jcolor=new jcolorchooser();color fcolor=jta.getforeground();jta.setforeground( jcolor.showdialog(jta,fcolor); public void action()jta.setlinewrap(true);/public void actionperformed(actionevent e )public void savefile() private void openfile()jfilechooser filechoose=new jfilechooser(); int result=filechoose.showopendialog(null); if(result=jfilechooser.approve_option) try file file=filechoose.getselectedfile(); filereader fr=new filereader(file); int len=(int)file.length(); char context=new charlen; fr.read(context,0,len); fr.close(); jta.settext(new string(context); jfilechooser filechoose=new jfilechooser(); int result=filechoose.showsavedialog(null); if(result=jfilechooser.approve_option) try file file=filechoose.getselectedfile(); filewriter fw=new filewriter(file); fw.write(jta.gettext(); fw.close(); catch(exception e)system.out.printl