java类,函数传参

package 传参练习;
//学生姓名组成的数组:指定区间和查找的名字返回此人是否存在(如果存在返回位置否则-1)
public class test1 {
    public static int findnamestu(String[] names,int start,int end,String name) {
      int pos=-1;
      for(int i=start;i<=end;++i) {
        if(names[i].equals(name)) {
          pos=i;
        }
      }
      return pos;
    }
  public static void main(String[] args) {
    String [] names= {"张三","李四","王二","麻子","拉大"};
    int start =0;
    int end=4;
    String name="王二";
    int result=findnamestu(names, start, end, name);
    
    System.out.println(result);
  }

}

package 类的练习;

public class Student {
      String name;
      int javaScore;
      int sqlScore;
      
      public double getAvg() {
        return getSum()/2.0;
      }
      
      public int getSum() {
        return javaScore+sqlScore;
      }
}


package 类的练习;
//有三个学生,每个学生有姓名,两门成绩,计算每个学生的平均分,总分,总分按照从小到大排序
public class TestStudent {
    public static void compareStudent(Student[] students) {
      //冒泡排序
      for(int i=0;i<students.length-1;++i) {
        for(int j=0;j<students.length-1-i;++j) {
          if(students[j].getSum()<students[j+1].getSum()) {
            Student temp=students[j];
            students[j]=students[j+1];
            students[j+1]=temp;
          }
        }
      }
    }
  public static void main(String[] args) {
     Student stu1=new Student();
     stu1.name="张三";
         stu1.javaScore=47;
         stu1.sqlScore=38;
         
         Student stu2=new Student();
     stu2.name="李四";
         stu2.javaScore=68;
         stu2.sqlScore=97;
         
         Student stu3=new Student();
     stu3.name="王二";
         stu3.javaScore=89;
         stu3.sqlScore=98;
         
         double stu1Avg=stu1.getAvg();
         double stu2Avg=stu2.getAvg();
         double stu3Avg=stu3.getAvg();
         System.out.println(stu1.name+"\t总分为:"+stu1.getSum()+"\t平均分为:"+stu1.getAvg());
         System.out.println(stu2.name+"\t总分为:"+stu2.getSum()+"\t平均分为:"+stu2.getAvg());
         System.out.println(stu3.name+"\t总分为:"+stu3.getSum()+"\t平均分为:"+stu3.getAvg());
         System.out.println("*************************************************");   
         Student [] students=new Student[] {stu1,stu2,stu3};
         
         for(Student student: students) {
           System.out.println(student.name+"\t总分为:"+student.getSum()+"\t平均分为:"+student.getAvg());
         }
         compareStudent(students);
         
         //排序后的数据
         System.out.println("*************************************************");
         for(Student student: students) {
           System.out.println(student.name+"\t总分为:"+student.getSum()+"\t平均分为:"+student.getAvg());
         }
  }

}