java helloworld java

java测试helloworld\importjava.awt.Graphics;importjava.applet.Applet;publicclassapp2extendsApplet{intx,y;publicvoidinit(){x=8;y=7;}publicvoidpaint(Graphicsg){g.drawString("类中定义两个变量：x=8y=7",50,60);g.drawString("他们的和是："+(x+y),50,80);g.drawString("他们的差是："+(x-y),50,100);}}