矩阵乘法运算-JAVA实现

用JAVA写了个矩阵乘法运算.没什么好解释的.直接贴代码吧.

 

public class Matrix {
	int row;
	int col;
	private int[][] array;
	
	private Matrix(){
		//构造函数私有化，使用setArray方法进行初始化
	}
	
	public int[][] getArray() {
		return array;
	}

	public void setArray(int[][] array) {
		//判断   二维数组是否为合法矩阵
		int row = array.length;
		int col = array[0].length;
		for(int i = 1;i < row;i++){
			if(col!=array[i].length){
				System.out.println("输入的不是一个矩阵,请重新输入");
				return;
			}
		}
		this.row = row;
		this.col = col;
		this.array = array;
	}
	
	public String toString(){
		if(array==null){
			return "矩阵为空，请输入一个矩阵";
		}
		String s ="";
		row = array.length;
		col = array[row-1].length;
		
		for(int i = 0;i < row;i++){
			for(int j = 0;j < col;j++){
				s+=array[i][j]+" ";
			}
			s+="\r\n";
		}
			
		return s;
	}
	public Matrix multip(Matrix x){
		Matrix m = new Matrix();
		m.setArray(multip(x.getArray()));
		return m;
		
	}
	private int[][] multip(int[][] aim){
		if(this.col!=aim.length){
			System.out.println("两个矩阵不能相乘");
			return null;
		}
		int[][] result = new int[this.row][aim[0].length];
		for(int row = 0;row < this.row;row++){
			for(int col = 0;col < aim[0].length;col++){
				int num = 0;
				for(int i = 0;i <this.col;i++){
					num+=array[row][i]*aim[i][col];
				}
				
				result[row][col]=num;
			}
		}
		return result;
	}
	
	public static void main(String[] args) {
		Matrix m = new Matrix();
		Matrix m2 = new Matrix();
		int[][]rec = {{1,0,3},{2,1,3},{3,5,7}};
		int[][]rec2 = {{4,1},{1,1},{2,0}};
		
		m.setArray(rec);
		m2.setArray(rec2);

		System.out.println(m);
		System.out.println(m2);
		System.out.println(m.multip(m2));
		
	}
	
}