例63计算器的部分程序 import java. awt import java. awt event public class Calc1 implements ActionListener Frame f TextField tf1 Button b1,b2,b3 b4 public void display f= new Frame Calculation") f setsize (260, 150) f setLocation (320, 240) ∥设置窗口初始位置 f setBackground(color light Gray) f. setLayout(new FlowLayout(FlowLayout LEFT) ∥改变布局且左对齐例6.3 计算器的部分程序 import java.awt.*; import java.awt.event.*; public class Calc1 implements ActionListener { Frame f; TextField tf1; Button b1,b2,b3,b4; public void display() { f = new Frame("Calculation"); f.setSize(260,150); f.setLocation(320,240); //设置窗口初始位置 f.setBackground(Color.lightGray); f.setLayout(new FlowLayout(FlowLayout.LEFT)); //改变布局且左对齐