求助一个java程序问题

public class test {
private int year ;
private int month ;
private int day ;


//用于初始化：构造函数，调用输入
public test(int year, int month, int day) {
setYear(year);
setMonth(month);
setDay(day);
}

//修改日期
public void setYear(int year) {
if(year >= 1000 && year <= 2200)
this.year = year;
else
System.out.println("error.");
}


public void setMonth(int month) {
if(month >= 1 && month <=12)
this.month = month;
else
System.out.println("error.");
}

public void setDay(int day) {
switch(month){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
if(day >= 1 && day <=31)
this.day = day;
else
System.out.println("error."); System.exit(-1);
case 4:
case 6:
case 9:
case 11:
if(day >= 1 && day <=30)
this.day = day;
else
System.out.println("error."); System.exit(-1);
case 2:
if(year%4 == 0){
if(day >= 1 && day <=29)
this.day = day;
else
System.out.println("error."); System.exit(-1);
}
else{
if(day >= 1 && day <=28)
this.day = day;
else
System.out.println("error."); System.exit(-1);
}
}


}

//返回该日期的年＼月＼日
public int getYear() {
return year;
}

public int getMonth() {
return month;
}

public int getDay() {
return day;
}

//返回描述日期的字符串
public String showDate(){
return(getYear() + "-" + getMonth() + "-" + getDay());
}


public static void main(String[] agrs){
test d1 = new test(2009,3,16);
System.out.println(d1.showDate());
}

}

我不晓得你把代码贴出来搞么事，你也没说明要搞么事，

但是我看出几个错了 if else 不写{}的前提该下面只有一句代码

setDay()方法switch没break。

public void setDay(int day) { switch(month){ case 1: case 3: case 5: case 7: case 8: case 10: case 12: if(day >= 1 && day <=31) { this.day = day; break; } else { System.out.println("error."); System.exit(-1); } case 4: case 6: case 9: case 11: if(day >= 1 && day <=30) { this.day = day; break; } else { System.out.println("error."); System.exit(-1); } case 2: if(year%4 == 0){ if(day >= 1 && day <=29) { this.day = day; break; } else { System.out.println("error."); System.exit(-1); } } else{ if(day >= 1 && day <=28){ this.day = day; break; } else{ System.out.println("error."); System.exit(-1); } } }

改下可以跑了