以下是我的我只用main函數編的代碼：
package?com.jieduan1;
import?java.util.Arrays;
public?class?demo06?{
????
????//完成?main?方法
????public?static?void?main(String[]?args)?{
????????int?[]?scores1={89,-23,64,91,119,52,73};
????????int?n=0;
????????for?(int?i=0;i<scores1.length;i++)?{
????????	if?(scores1[i]>=0&&scores1[i]<=100)?{
????????		n++;
????????	}
????????}
????????System.out.println("有效成績個數為："+n);
????????int?[]?scores2=new?int[n];
????????int?j=0;
????????for?(int?i=0;i<scores1.length;i++)?{
????????	if?(scores1[i]>=0&&scores1[i]<=100)?{
????????		scores2[j]=scores1[i];
????????		j++;
????????	}
????????	
????????}
????????System.out.println("輸出有效成績："+Arrays.toString(scores2));
????????Arrays.sort(scores2);
????????System.out.println("輸出排序后的有效成績："+Arrays.toString(scores2));
????????int?[]?scores3=new?int?[3];
????????int?k=3-1;
????????for?(int?i=n-3;i<n;i++)?{
????????	scores3[k]=scores2[i];
????????	k--;
????????}
????????System.out.println("輸出前三名成績："+Arrays.toString(scores3));
????????for?(int?i=0;i<3;i++)?{
????????	System.out.println("考試成績的第"+(i+1)+"名為："+scores3[i]);
????????}
????????
????????
????????
????}
????
????
????
????
????
????
????
}
執行結果為：
有效成績個數為：5
輸出有效成績：[89,?64,?91,?52,?73]
輸出排序后的有效成績：[52,?64,?73,?89,?91]
輸出前三名成績：[91,?89,?73]
考試成績的第1名為：91
考試成績的第2名為：89
考試成績的第3名為：73