Data commit

Task/Pseudo-random-numbers-Middle-square-method/Java/pseudo-random-numbers-middle-square-method.java

@@ -0,0 +1,35 @@
+public final class MiddleSquareTask {
+
+	public static void main(String[] aArgs) {
+		MiddleSquare random = new MiddleSquare(675248);
+		
+		for ( int i = 0; i < 5; i++ ) {
+	        System.out.println(random.nextInt());
+		}
+	}	
+
+}
+
+final class MiddleSquare {
+	
+	public MiddleSquare(int aSeed) {
+		final int length = String.valueOf(aSeed).length();
+		if ( length % 2 == 1 ) {
+			throw new IllegalArgumentException("Seed must have an even number of digits");
+		}
+		
+		state = aSeed;
+		divisor = (int) Math.pow(10, length / 2);
+		modulus = (int) Math.pow(10, length);
+	}
+	
+	public int nextInt() {
+		state = ( ( state * state ) / divisor ) % modulus;		
+		return (int) state;
+	}
+	
+	private long state;
+	
+	private final int divisor, modulus;
+	
+}