请使用NetBeans打开考生文件夹下的项目 Java-3, 该项目中的源文件 Java-3.Java 是不完整的,请在注释行“ //**********Found********* ”下一行语句的下划线地方填入正确内容,然后删除下划线,请勿删除注释行或改动其他已有语句内容。存盘时不得改变原有文件的文件名及存放目录。 本题要求:对三处进行填写语句,该程序功能是计算学生的考生分数的平均分的Applet。程序运行结果如下: //DoubleArray.java import java.awt.*; import javax.swing.*; public class Java_3 extends JApplet { int grades[][] = { { 77, 68, 86, 73 }, { 96, 87, 89, 81 }, { 70, 90, 86, 81 } }; int students, exams; String output; JTextArea outputArea; //对实例变量初始化 public void init(){ students = grades.length; exams = grades[ 0 ].length; //*********Found********** outputArea = new ___________________(); Container c = getContentPane(); c.add( outputArea ); //输出 output = "数组是:"; buildString(); output += "\n\n最低分: " + minimum() + "\n最高分: " + maximum() + "\n"; for ( int i = 0; i < students; i++ ) output += "\n学生的平均分" + i + " 组是 " + average( grades[ i ] ); outputArea.setFont( new Font( "Courier", Font.PLAIN, 12 ) ); outputArea.setText( output ); } //找最底分 public int minimum(){ int lowGrade = 100; for ( int i = 0; i < students; i++ ) for ( int j = 0; j < exams; j++ ) if ( grades[ i ][ j ] < lowGrade ) lowGrade = grades[ i ][ j ]; //*********Found********** return __________________; } //找最高分 public int maximum(){ int highGrade = 0; for ( int i = 0; i < students; i++ ) for ( int j = 0; j < exams; j++ ) if ( grades[ i ][ j ] > highGrade ) highGrade = grades[ i ][ j ]; return highGrade; } //对各组学生确定平均分 public double average( int setOfGrades[] ){ int total = 0; for ( int i = 0; i < setOfGrades.length; i++ ) total += setOfGrades[ i ]; //*********Found********** return ( double ) total / ________________________; } //输出格式 public void buildString(){ output += " "; for ( int i = 0; i < exams; i++ ) output += "[" + i + "] "; for ( int i = 0; i < students; i++ ) { output += "\ngrades[" + i + "] "; for ( int j = 0; j < exams; j++ ) output += grades[ i ][ j ] + " "; } } }