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重点内容：

矩阵赋值、二重循环

package day7;import java.util.Arrays;public class MatrixAddition {	/**	 *********************	 * 程序开始.	 * 	 * @param args Not used now.	 *********************	 */	public static void main(String args[]) {		matrixElementSumTest();		matrixAdditionTest();	}// Of main	/**	 *********************	 * 对一个矩阵元素进行求和.	 * 	 * @param paraMatrix The given matrix.	 * @return The sum of all its elements.	 *********************	 */	public static int matrixElementSum(int[][] paraMatrix) {		int resultSum = 0;		for (int i = 0; i < paraMatrix.length; i++) {			for (int j = 0; j < paraMatrix[0].length; j++) {				resultSum += paraMatrix[i][j];			} // Of for j		} // Of for i		return resultSum;	}// Of matrixElementSum	/**	 *********************	 * 给一个矩阵赋值并调用矩阵求和函数进行输出.	 *********************	 */	public static void matrixElementSumTest() {		int[][] tempMatrix = new int[3][4];		for (int i = 0; i < tempMatrix.length; i++) {			for (int j = 0; j < tempMatrix[0].length; j++) {				tempMatrix[i][j] = i * 10 + j;			} // Of for j		} // Of for i		System.out.println("The matrix is: \r\n" + Arrays.deepToString(tempMatrix));		System.out.println("The matrix element sum is: " + matrixElementSum(tempMatrix) + "\r\n");	}// Of matrixElementSumTest	/**	 *********************	 * 对两个矩阵进行相加	 * 	 * @param paraMatrix1 The first matrix matrix.	 * @param paraMatrix2 The second matrix matrix. It should have the same size as	 *                    the first one.	 * @return The addition of these matrices.	 *********************	 */	public static int[][] matrixAddition(int[][] paraMatrix1, int[][] paraMatrix2) {		int[][] resultMatrix = new int[paraMatrix1.length][paraMatrix1[0].length];		for (int i = 0; i < paraMatrix1.length; i++) {			for (int j = 0; j < paraMatrix1[0].length; j++) {				resultMatrix[i][j] = paraMatrix1[i][j] + paraMatrix2[i][j];			} // Of for j		} // Of for i		return resultMatrix;	}// Of matrixAddition	/**	 *********************	 * 调用矩阵相加并输出.	 *********************	 */	public static void matrixAdditionTest() {		int[][] tempMatrix = new int[3][4];		for (int i = 0; i < tempMatrix.length; i++) {			for (int j = 0; j < tempMatrix[0].length; j++) {				tempMatrix[i][j] = i * 10 + j;			} // Of for j		} // Of for i		System.out.println("The matrix is: \r\n" + Arrays.deepToString(tempMatrix));		int[][] tempNewMatrix = matrixAddition(tempMatrix, tempMatrix);		System.out.println("The new matrix is: \r\n" + Arrays.deepToString(tempNewMatrix));	}// Of matrixAdditionTest}// Of class MatrixAddition

输出结果：

The matrix is: [[0, 1, 2, 3], [10, 11, 12, 13], [20, 21, 22, 23]]The matrix element sum is: 138The matrix is: [[0, 1, 2, 3], [10, 11, 12, 13], [20, 21, 22, 23]]The new matrix is: [[0, 2, 4, 6], [20, 22, 24, 26], [40, 42, 44, 46]]

熟悉并理解Java矩阵创建和赋值操作，多练习。

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