private String sunday;
    private String monday;
    private String tuesday;
    private String wednesday;
    private String thursday;
    private String friday;
    private String saturday;

Calendar c = Calendar.getInstance();
c.set(Calendar.Date, 1);
//获得1号是星期几
int start = c.get(Calendar.DAY_OF_WEEK);
//获得当前月的最大日期数
int maxDay = c.getActualMaximum(Calendar.DATE);

System.out.println("星期日\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六");
for(int i = 1; i < start; i++){
   System.out.print("\t");
}
for(int i = 1; i <= maxDay; i++){
   System.out.print("" + i);
   System.out.print("\t");
   if(i < 10){
      System.out.print("");
   }
   if((start + i - 1)%7 == 0){
      System.out.println();
   }
   System.out.println();
}

------解决方案--------------------

看楼主是做android的吧  所以很多时候不能用jdk里面的方法  因为不知道android里面的jdk有没有那个类或者其中的方法  所以最好自己写了  

Java code

public int getWeekDay(int year,int month){
        int days=1;//这里以windows操作系统为例  也就是:日一二三四五六    如果要换其他的可以在这个方法里面改
        for(int i=1900;i<year;i++){
            if(isLeapYear(i)){
                days+=366;
            }
            else{
                days+=365;
            }
        }
        for (int i = 1; i < month; i++) {
            days+=getMonthDay(year, i);
        }
        return days%7;
    }
    public boolean isLeapYear(int year){
        return ((year%4==0&&year%100!=0)||year%400==0);
    }
    public int getMonthDay(int year,int month){
        //31:1 3 5 7 8 10 12    30:4 6 9 11    28/29:2
        if(month==2){
            if(isLeapYear(year)){
                return 29;
            }
            else{
                return 28;
            }
        }
        else if(month<13){
            if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
                return 31;
            }
            else{
                return 30;
            }
        }
        return 0;
    }
    public int[][] getMonthData(int year,int month){
        int weekDay=getWeekDay(year, month);//获取本月第一天是星期几
        int ed=getMonthDay(year, month)-(7-weekDay);
        int length=1;
        int point=ed%7;
        if(point>0){
            length+=ed/7+1;
        }
        else{
            length+=ed/7;
        }
        int[][] data=new int[length][7];
        int count=0;
        int week=0;
        for (int i = 1; i <= getMonthDay(year, month); i++) {
            if(count==0){
                if(i==1){
                    week+=weekDay;
                }
                data[count][week]=i;
            }
            else{
                data[count][week]=i;
            }
            week++;
            if((weekDay+i)%7==0){
                count++;
            }
            if(week==7){
                week=0;
            }
        }
        return data;
    }
    public String getString(int num){
        return num==0?"":num+"";
    }
    public ArrayList<DateTimeV> getMonth(int year,int month){
        int[][] data=getMonthData(year, month);
        ArrayList<DateTimeV> list=new ArrayList<DateTimeV>();
        for (int i = 0; i < data.length; i++) {
            list.add(new DateTimeV(getString(data[i][0]), getString(data[i][0]), getString(data[i][0]), getString(data[i][0]), getString(data[i][0]), getString(data[i][0]), getString(data[i][0])));
        }
        return list;
    }