ماتریس اکسپت

public class Matrix {
	private int row;
	private int column;
	private int[][] elements;

	public Matrix(int row, int column) {
		this.row=row;
		this.column=column;
		elements=new int[row][column];
		//TODO
	}
	
	public Matrix(int length){
		this(length,length);
		//TODO
	}
	
	public Matrix(int[][] elements){
		this.elements=elements;
		for(int i=0;i<elements.length;i++)
		{
			column=Math.max(column, elements[i].length);
		}
		row=elements.length;
		//TODO
	}
	
	public int getRow() {
		return this.row;
		//TODO
	}

	public int getColumn() {
		return this.column;
		//TODO
	}

	public int[][] getElements() {
		return this.elements;
		//TODO
	}

	public boolean add(Matrix newMatrix) {
		if(newMatrix.getRow()==this.getRow()&& newMatrix.getColumn()==this.getColumn())
		{
			
//			this.elements+=newMatrix;
			for(int i=0;i<row;i++)///??????????????????
				for(int j=0;j<column;j++)
					elements[i][j]+=newMatrix.elements[i][j];
			return true;
					
		}
		return false;
		//TODO
	}
	
	public void setElement(int i, int j, int value){
		elements[i][j]=value;
		//TODO
	}

	public boolean isSquareMatrix() {
		return (row==column);
		//TODO
	}

	public void toLowerTriangular() {
		if(isSquareMatrix()) {
			for(int i=0;i<row;i++)
			{
				for(int j=i+1;j<column;j++)
					elements[i][j]=0;
			}
			
		}
		//TODO
	}

	public void toUpperTriangular() {
		if(isSquareMatrix()) {
			for(int i=0;i<row;i++)
			{
				for(int j=0;j<i;j++)
					elements[i][j]=0;
			}
			
		}
		//TODO
	}

}