package test;import javax.swing.JOptionPane;public class test { public static void main(String[] args){ JOptionPane.showMessageDialog(null,"HelloWorld!", "Title",JOptionPane.INFORMATION_MESSAGE); }}JOptionPane.showMessageDialog(null,"Welcome to Java!", //顯示的內容"Display Message", //標題JOptionPane.INFORMATION_MESSAGE 顯示倒感嘆號圖標);調用showMessageDialog方法有兩種方式:x 是要顯示的字符串一:JOptionPane.showMessageDialog(null,x, "Title",JOptionPane.INFORMATION_MESSAGE);二:JOptionPane.showMessageDialog(null,x);
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