java编程,设计一个窗体,要有三个部分(文本框、按钮、标签),按钮内容输出...答:package anfang;import java.awt.*;import java.awt.event.*;public class example1 extends Frame{ Frame frm;Button btn1,btn2,btn3,btn4;TextField txt1,txt2,txt3;public example1(){ setLayout(null);btn1 = new Button("+");btn1.setLocation(55,55);btn1.setSize(80,20);class ...