JAVA制作简易ATM系统

package shenca; import java.util.Scanner; public class MainPage { public static void main(String[] args) { } public void mainPage(){ System.out.println("*******************银行系统*******************"); System.out.println(" *"); System.out.println(" ①申请银行卡"); System.out.println(" *"); System.out.println(" ②ATM机服务"); System.out.println(" *"); System.out.println(" ③退出"); System.out.println(" *"); System.out.println("*********************************************"); System.out.println(" "); System.out.println("请选择您的服务："); Scanner sca=new Scanner(System.in); String str=sca.nextLine(); } public void shenKaPage(String str){ System.out.println("请选择您的服务:"+str); System.out.println("*******************申请银行卡*******************"); System.out.println("请输入姓名："); Scanner sca=new Scanner(System.in); String sn=sca.nextLine(); while(sca.hasNext()){ char c[]=sn.toCharArray(); for(int i=0;i<c.length;i++){ if(c[i]==' '){ System.out.println("姓名不正确，请重新输入"); break; } } System.out.println("请输入姓名："); while(sn=="\n") System.out.println("请输入密码："); String sm=sca.nextLine(); } } }