java long转日期，long转String

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//long转Date
private Date LongToDate(long str) {
		Date date = new Date(str*1000);
		return date;
	}
//long转String
private String LongToString(long str) {
	    SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
	    String string = sdf.format(str*1000);
		return string;
	}