And

java/matrix/MatrixAddition.java

@@ -0,0 +1,18 @@
+public class MatrixAdditionExample{  
+public static void main(String args[]){  
+//creating two matrices    
+int a[][]={{1,3,4},{2,4,3},{3,4,5}};    
+int b[][]={{1,3,4},{2,4,3},{1,2,4}};    
+
+//creating another matrix to store the sum of two matrices    
+int c[][]=new int[3][3];  //3 rows and 3 columns  
+
+//adding and printing addition of 2 matrices    
+for(int i=0;i<3;i++){    
+for(int j=0;j<3;j++){    
+c[i][j]=a[i][j]+b[i][j];    //use - for subtraction  
+System.out.print(c[i][j]+" ");    
+}    
+System.out.println();//new line    
+}    
+}}  

java/matrix/matrixSub.java

@@ -0,0 +1,18 @@
+public class MatrixSubExample{  
+public static void main(String args[]){  
+//creating two matrices    
+int a[][]={{1,3,4},{2,4,3},{3,4,5}};    
+int b[][]={{1,3,4},{2,4,3},{1,2,4}};    
+
+//creating another matrix to store the difference of two matrices    
+int c[][]=new int[3][3];  //3 rows and 3 columns  
+
+//Subtracting and printing addition of 2 matrices    
+for(int i=0;i<3;i++){    
+for(int j=0;j<3;j++){    
+c[i][j]=a[i][j]-b[i][j];    //use - for subtraction  
+System.out.print(c[i][j]+" ");    
+}    
+System.out.println();//new line    
+}    
+}}  

java/sorting/matrixSort.java

@@ -0,0 +1,36 @@
+import java.util.*;
+
+public class Main {
+	public static void main(String[] args)
+	{
+		// Initialize the 2D vector with some values
+		List<List<Integer> > v
+			= new ArrayList<>(Arrays.asList(
+				new ArrayList<>(Arrays.asList(5, 4, 7)),
+				new ArrayList<>(Arrays.asList(1, 3, 8)),
+				new ArrayList<>(Arrays.asList(2, 9, 6))));
+
+		int n = v.size();
+		List<Integer> x = new ArrayList<>();
+		for (int i = 0; i < n; i++) {
+			for (int j = 0; j < n; j++) {
+				x.add(v.get(i).get(j));
+			}
+		}
+		Collections.sort(x);
+		int k = 0;
+		for (int i = 0; i < n; i++) {
+			for (int j = 0; j < n; j++) {
+				v.get(i).set(j, x.get(k++));
+			}
+		}
+
+		System.out.println("Sorted Matrix Will be:");
+		for (List<Integer> row : v) {
+			for (int num : row) {
+				System.out.print(num + " ");
+			}
+			System.out.println();
+		}
+	}
+}