请使用 NetBeans 打开考生文件夹下的项目 Java_2, 本题功能是完成对骰子旋转 500 次后,并输出骰子每面出现的频率 ( 起始面是随机的 ) 。要求进行调试后,某次程序结果如下。 由于 Java _2.java 文件不完整,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。 import javax.swing.*; public class Java_2{ public static void main( String args[] ){ int frequency1 = 0, frequency2 = 0, frequency3 = 0, frequency4 = 0, frequency5 = 0, frequency6 = 0, face; //骰子旋转500次的代码 for ( int roll = 1; roll <= 500; roll++ ) { face = 1 + (int) ( Math.random() * 6 ); //*********Found********** switch ( __________________ ) { case 1: ++frequency1; break; case 2: ++frequency2; break; case 3: ++frequency3; break; case 4: ++frequency4; break; case 5: ++frequency5; break; case 6: ++frequency6; break; } } //*********Found********** JTextArea outputArea = _____________________ JTextArea( 7, 10 ); outputArea.setText( "面\t频率" + "\n1\t" + frequency1 + "\n2\t" + frequency2 + "\n3\t" + frequency3 + "\n4\t" + frequency4 + "\n5\t" + frequency5 + "\n6\t" + frequency6 ); //*********Found********** JOptionPane.showMessageDialog( null, ___________________, "骰子旋转500次", JOptionPane.INFORMATION_MESSAGE ); //*********Found********** System.____________________( 0 ); } }