修改Activity的标题样式及ActionBar ,代码如下 <!-- Application theme. --> <style name="AppTheme" parent="AppBaseTheme"> <!-- All customizations that are NOT specific to a particular API-level can go here. --> <!-- <item name=
编写一个程序,用户输入两个数,求出其加减乘除,并用消息框显示计算结果 import javax.swing.JOptionPane; public class Test{ public static void main(String[] args) { int n1=Integer.parseInt(JOptionPane.showInputDialog("Input number 1: ")); int n2=Integer.parseInt(JOptionPane.showInpu