englishstudent.java

此系统可用于对学生成绩进行简单管理

import javax.swing.JOptionPane;
class EnglishStudent extends Student{
	 	        
		private final int GAO_SHU_POINT=4;
		private final int YING_YU_POINT=6;
		private final int DA_XUE_YU_WEN_POINT=2;
		private final int MEI_XUE_JIAN_SHANG_POINT=2;
		private final int MA_ZHE_POINT=2;
		private final int DENG_LUN_POINT=2;
		private final int MAO_GAI_POINT=2;
		private final int DA_XUE_WU_LI_POINT=3;
		private final int TI_YU_POINT=2;
		private final int XIAN_DAI_POINT=2;
		private final int GAI_LV_POINT=2;
		
		
	    /*public ScienceStudent()
	    {
	 	       System.out.println("ScienceStudent's constractor!");
	    }*/
	    			    
	   public void calculateGradePoint()  //GUI version
	   {
   	          double temp=getSubjectPoint(gaoShuGrade)*GAO_SHU_POINT+
   	                          getSubjectPoint(yingYuGrade)*YING_YU_POINT+
   	                          getSubjectPoint(daXueYuWenGrade)*DA_XUE_YU_WEN_POINT+
   	                          getSubjectPoint(meiXueJianShangGrade)*MEI_XUE_JIAN_SHANG_POINT+
   	                          getSubjectPoint(maZheGrade)*MA_ZHE_POINT+
   	                          getSubjectPoint(dengLunGrade)*DENG_LUN_POINT+
   	                          getSubjectPoint(maoGaiGrade)*MAO_GAI_POINT+
   	                          getSubjectPoint(daXueWuLiGrade)*DA_XUE_WU_LI_POINT+
   	                          getSubjectPoint(tiYuGrade)*TI_YU_POINT+
   	                          getSubjectPoint(xianDaiGrade)*XIAN_DAI_POINT+
   	                          getSubjectPoint(gaiLvGrade)*GAI_LV_POINT;
   	          finalGradePoint=temp/(GAO_SHU_POINT+YING_YU_POINT+DA_XUE_YU_WEN_POINT+
	                                MEI_XUE_JIAN_SHANG_POINT+MA_ZHE_POINT+DENG_LUN_POINT+
	                                MAO_GAI_POINT+DA_XUE_WU_LI_POINT+TI_YU_POINT+
	                                XIAN_DAI_POINT+GAI_LV_POINT);
	   	                        	   	                       	    	   
    	      if(finalGradePoint>=4)
    	      finalLetterGrade="A";
    	      else 
    	      if((finalGradePoint>=3)&(finalGradePoint<4))
    	      finalLetterGrade="B";
    	      else 
    	      if((finalGradePoint>=2)&(finalGradePoint<3))
    	      finalLetterGrade="C";
    	      else 
    	      if((finalGradePoint>=1)&(finalGradePoint<2))
    	      finalLetterGrade="D";
    	      if(finalGradePoint<1)
    	      finalLetterGrade="F";
	   }
}