package com.sleep.memory;

import org.apache.lucene.util.RamUsageEstimator;

import org.junit.Test;

import java.util.ArrayList;

public class TestMemory {

public static void main(String[] args) {

int i = 155;

System.out.println(RamUsageEstimator.sizeOf(i));

long l = 122L;

System.out.println(RamUsageEstimator.sizeOf(l));

Tshirt tshirt = new Tshirt();

System.out.println(RamUsageEstimator.sizeOf(tshirt));

ArrayList<Object> objects = new ArrayList<>();

System.out.println(RamUsageEstimator.sizeOf(objects));

// 40+length*2+padding

String s1 = "";

String s2 = "a";

String s3 = "aa";

String s4 = "aaaa";

System.out.println(RamUsageEstimator.sizeOf(s1));

System.out.println(RamUsageEstimator.sizeOf(s2));

System.out.println(RamUsageEstimator.sizeOf(s3));

System.out.println(RamUsageEstimator.sizeOf(s4));

}

@Test

public void TestObject(){

/**

* integer+long =40 =12+

* int+long=24 =12+4+8

*/

Tshirt tshirt = new Tshirt();

System.out.println(RamUsageEstimator.sizeOf(tshirt));

}

/**

* 12+4()+4+4

* 40+length*4(8)

*/

@Test

public void TestListLength(){

ArrayList<Integer> list = new ArrayList<Integer>();

System.out.println(RamUsageEstimator.sizeOf(list));

list.add(12321);

System.out.println(RamUsageEstimator.sizeOf(list));

list.add(1234);

System.out.println(RamUsageEstimator.sizeOf(list));

}

/**

* new int[0]=16

* new int[1]=24

* new int[2]=24

* new int[3]=32

*/

@Test

public void TestListArray(){

int[] arrays = new int[3];

System.out.println(RamUsageEstimator.sizeOf(arrays));

// arrays[0]=123;

System.out.println(RamUsageEstimator.sizeOf(arrays));

// arrays[1]=123;

System.out.println(RamUsageEstimator.sizeOf(arrays));

}

}