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Java Program Design Final Examination(Paper B) （notification：Examination time is 120 minutes，all result should be wrote in answer sheet） Class：________ Number：_________ Name:___________ 1、Discriminate the following sentences, if finding errors, please give your reasons（16 points） 1、Java can implement multi-thread operation only in terms of implementing Runnable interface. 2、There is no difference between error and exception in Java program. 3、? The purpose of importing LayoutManager in Java is to enhance the beauty of interface. 4、? In Java program, threads work in terms of cooperative multi-task fashion, they may share data and code. 2、Answer the following questions briefly.（24 points） 1、Please briefly explain the execution principle of java applet. 2、Which types of objects is the processing model of AWT event composed of? What are their functions? 3、When using socket to write Client / Server communication program supporting multi clients, what do we need key technologies? What are their working principles? 4、? Describe interactive method of Servlet and form. 3、Complement program（20 points） 1、The following program implement the multiplication of matrix A and matrix B, then the result is saved in matrix C. 　 public class MatrixMultiply{　 public static void main(String args[]){　　　int m,n,k;　　　int a[][]=new int [2][3]; int b[][]={{1,5,2,8},{5,9,10,-3},{2,7,-5,-18}};　　　　　　　　　　　　　　　　　　 　　　int c[][]=new int[2][4]; 　　　for (m=0;m2;m++)　　　　　for (n=0; n3 ;n++)　　　 a // Initialize the matrix A, every array // element’s value equals the multiplication of its two subscript values. 　for (m=0;m2;m++){　　　　　for (n=0;n4;n++){　　　　　　c[m][n]=0;　　　 for(k=0;k3;k++) b // Multiplication calculation of matrix. 　　　　　}　　 } } 2、The following class sequentially read a readable file, the operation will stop when meeting “Bye” string or arriving to EOF. import java.io.*;　　 public class