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1、实验二1．源代码importjava.util.*;publicclassinou{privatefinalstaticScannerscanner=newScanner(System.in);publicstaticvoidmain(String[]args){inta;intb;intc;a=scanner.nextInt();b=scanner.nextInt();c=a+b;System.out.println("a="+a);System.out.println("b="+b);System.out.print("a+b
2、=");System.out.println(c);}}1.21.源代码publicclassSimpleMenu{publicstaticvoidmain(Stringa[]){System.out.println("********************");System.out.println("*1.求圆面积*");System.out.println("*2.求圆周长*");System.out.println("*0.退出*");System.out.println("********************");}
3、}2源代码publicclassMy{publicstaticvoidmain(Stringa[]){System.out.println(you.info);}}classyou{staticStringinfo="同学们好！";}3源代码importjava.awt.*;importjava.applet.Applet;publicclasstriangleextendsApplet{publicvoidpaint(Graphicsg){g.setColor(Color.red);//设置画笔颜色为红色g.drawLine(8
4、0,20,20,100);g.drawLine(20,100,140,100);g.drawLine(140,100,80,20);g.setColor(Color.blue);//设置画笔颜色为兰色g.drawString("三角形",65,80);}}把三角形文字改成绿色源代码importjava.awt.*;importjava.applet.Applet;publicclasstriangleextendsApplet{publicvoidpaint(Graphicsg){g.setColor(Color.red);//设
5、置画笔颜色为红色g.drawLine(80,20,20,100);g.drawLine(20,100,140,100);g.drawLine(140,100,80,20);g.setColor(Color.green);//设置画笔颜色为绿色g.drawString("三角形",65,80);}}编程练习源代码importjava.applet.*;importjava.awt.Graphics;publicclassJava_1extendsApplet{publicvoidpaint(Graphicsg){g.drawStri
6、ng("欢迎你来参加Java语言考试！",25,25);}}正方形源代码importjava.applet.Applet;importjava.awt.Color;importjava.awt.Graphics;publicclassdrawPracticeextendsApplet{publicvoidpaint(Graphicsg){g.setColor(Color.blue);//设置颜色为蓝色g.drawRect(10,80,70,60);//画一个正方形g.setColor(Color.black);g.drawOval
7、(10,80,70,60);//画一个正方形内切圆g.setColor(Color.red);g.fillOval(100,30,90,90);g.setColor(Color.blue);g.fillOval(120,50,50,50);g.setColor(Color.black);g.drawString("圆心",135,80);}}实验三2.1源代码publicclasstest1{publicstaticvoidmain(Stringargs[]){inta=20;booleanb=true;doublec=30141
8、59;chard='a';System.out.println(a+","+b+","+c+","+d);}}2.1.1源代码publicclasstest1{publicstaticvoidmain(Stringargs[]){inta=1234
