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MainClass.java

@@ -0,0 +1,59 @@
+public class MainClass {
+    static final int size = 10000000;
+    static final int h = size / 2;
+    public static void main(String[] args) {
+        MainClass e1 = new MainClass();
+        System.out.println("Start");
+        new Thread(() -> e1.method1()).start();
+        new Thread(() -> e1.method2()).start();
+    }
+    public synchronized void method1() {
+
+        float[] arr = new float[size];
+        for (int i = 0 ; i < size ; i ++) {
+            arr[i] = 1 ;
+        }
+        long a = System.currentTimeMillis();
+        calc(arr);
+        System.out.println(System.currentTimeMillis() - a + " метод 1");
+
+    }
+    public synchronized void method2() {
+        float[] arr = new float[size];
+        float[] arr1 = new float[h];
+        float[] arr2 = new float[h];
+
+        for (int i = 0 ; i < size ; i ++) {
+            arr[i] = 1 ;
+        }
+
+        long a = System.currentTimeMillis();
+        System.arraycopy(arr, 0, arr1, 0, h);
+        System.arraycopy(arr, h, arr2, 0, h);
+
+        new Thread() {
+            public void run() {
+                float[] a1 = calc(arr1);
+                System.arraycopy(a1, 0, arr1, 0, a1.length);
+            }
+        }.start();
+
+        new Thread() {
+            public void run() {
+                float[] a2 = calc(arr2);
+                System.arraycopy(a2, 0, arr2, 0, a2.length);
+            }
+        }.start();
+
+        System.arraycopy(arr1, 0, arr, 0, h);
+        System.arraycopy(arr2, 0, arr, h, h);
+        System.out.println((System.currentTimeMillis() - a)+ " метод 2");
+    }
+    public float[] calc(float[] arr) {
+        for (int i = 0; i < arr.length; i++)
+            arr[i] = (float) (arr[i] * Math.sin(0.2f + arr[i] / 5) * Math.cos(0.2f + arr[i] / 5) * Math.cos(0.4f + arr[i] / 2));
+        return arr;
+    }
+}
+
+