我目前正在研究可在代码中提示学生级别类型的代码（切换用例），并确定每种学生将获得的现金金额。然后，我想对每个学生级别获得的所有现金进行汇总。我是一个初学者，只学习Java几个星期，任何建议都非常感谢。这是我所做的工作，也有注释。
System.out.print("Level code :");
levelCode = input.next().charAt(0);
do {
switch (levelCode) {
case 'F':
System.out.print("Total Foundation student = ");
studentFoundation = input.nextInt();
foundationCash = studentFoundation * 50;
break;
case 'D':
System.out.print("Total Diploma student = ");
studentDiploma = input.nextInt();
diplomaCash = studentDiploma * 50;
break;
case 'B':
System.out.print("Total Bachelor student = ");
studentBachelor = input.nextInt();
bachelorCash = studentBachelor * 70;
break;
case 'M':
System.out.print("Total Master student = ");
studentMaster = input.nextInt();
masterCash = studentMaster * 90;
break;
case 'P':
System.out.println("Total PhD student = ");
studentPhd = input.nextInt();
phdCash = studentPhd * 90;
break;
default:
System.out.println("Invalid code");
break;
}
} while (levelCode < 5); //i dont know what to put here in order to loop the switch case
totalCash = foundationCash + diplomaCash + bachelorCash + masterCash + phdCash; //here i want to calculate all the input entered
System.out.println("Total cash amount = " + totalCash);
假设只希望在default执行完案例后返回循环，则可以用不同的方式来执行。
使用标签
LOOP: for (;;) { // forever loop
System.out.print("Level code :");
levelCode = input.next().charAt(0);
switch (levelCode) {
case 'F':
// code here
break LOOP; // <=== break out of the loop, not the switch statement
case 'D':
// code here
break LOOP; // <=== break out of the loop, not the switch statement
...
default:
// code here
}
}
使用布尔值
boolean error;
do {
System.out.print("Level code :");
levelCode = input.next().charAt(0);
error = false;
switch (levelCode) {
case 'F':
// code here
break;
case 'D':
// code here
break;
...
default:
error = true;
// code here
}
} while (error);
使用特殊值，例如null
String levelCode;
do {
System.out.print("Level code :");
levelCode = input.next();
switch (levelCode) {
case "F":
// code here
break;
case "D":
// code here
break;
...
default:
// code here
levelCode = null;
}
} while (levelCode == null);
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