Write java program to find sum of two matrices. Define appropriate class, constructor and methods in your program. Make necessary assumptions.

Here's a Java program that calculates the sum of two matrices using classes, constructors, and methods:

class Matrix {
    private int rows;
    private int cols;
    private int[][] data;

    public Matrix(int rows, int cols) {
        this.rows = rows;
        this.cols = cols;
        this.data = new int[rows][cols];
    }

    public void setData(int[][] data) {
        this.data = data;
    }

    public void inputMatrix() {
        System.out.println("Enter matrix elements:");
        Scanner scanner = new Scanner(System.in);
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
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