1.while 循环
2.do-while 循环
说明：
3.家庭收支记账系统
class FamilyAccount{
public static void main(String[] args){
boolean isFlag = true;
String details = "收支\t账户金额\t收支金额\t说 明\n";
int balance = 10000;
while(isFlag){
System.out.println("----------------家庭收支记账软件----------\n");
System.out.println(" 1 收支明细");
System.out.println(" 2 登记收入");
System.out.println(" 3 登记支出");
System.out.println(" 4 退 出\n");
System.out.print(" 请选择1-4：");
char selection = Utility.readMenuSelection();
switch (selection){
case '1':
System.out.println("--------------当前收支明细记录-------\n");
System.out.println(details);
System.out.println("--------------------------------------------------------\n");
break;
case '2':
System.out.println("本次收入金额：");
int addMoney = Utility.readNumber();
System.out.println("本次收入说明：");
String addInfo = Utility.readString();
balance += addMoney;
details += "收入\t"+balance+"\t\t "+addMoney+"\t\t "+addInfo+"\n";
System.out.println("--------本次登记完成--------\n");
break;
case '3':
System.out.println("本次支出金额：");
int minusMoney = Utility.readNumber();
System.out.println("本次支出说明：");
String minusInfo = Utility.readString();
if(balance >= minusMoney){
balance -= minusMoney;
details += "支出\t"+balance+"\t\t "+minusMoney+"\t\t "+minusInfo+"\n";
}else{
System.out.println("您的余额不足");
}
System.out.println("--------本次登记完成--------\n");
break;
case '4':
System.out.print("确认是否退出（Y/N）:");
char isExit = Utility.readConfirmSelection();
if(isExit == 'Y'){
isFlag = false;
}
break;
}
}
}
}
说明： 以上内容均来自尚硅谷Pdf
