Go directly to the code and conclusion:
package com.chz.apps.data.test;
import org.junit.Test;
public class DemoTest {
@Test
public void stringArrayTest(){
//准备数据
String[] bmp1 = new String[4800];
for (int i = 0 ; i < 4800 ; i++) {
bmp1[i] = i+"";
}
String[][] bmp2 = new String[80][60];
for (int i = 0 ; i < 80 ; i++) {
for (int j = 0 ; j < 60 ; j++) {
bmp2[i][j] = i+"-"+j;
}
}
//第一个测试
Long start = System.nanoTime();
for (int y = 0;y<60;y++){
String res = bmp1[40 + 80*y];
}
System.out.println("字符串数组-本次耗时1:"+(System.nanoTime() - start));
//第二个测试
start = System.nanoTime();
for(int y = 0;y<60;y++){
String res = bmp2[40][y];
}
System.out.println("字符串数组-本次耗时2:"+(System.nanoTime() - start));
}
@Test
public void intArrayTest(){
//准备数据
int[] bmp1 = new int[4800];
for (int i = 0 ; i < 4800 ; i++) {
bmp1[i] = i;
}
int[][] bmp2 = new int[80][60];
for (int i = 0 ; i < 80 ; i++) {
for (int j = 0 ; j < 60 ; j++) {
bmp2[i][j] = i+j;
}
}
//第一个测试
Long start = System.nanoTime();
for (int y = 0;y<60;y++){
int res = bmp1[40 + 80*y];
}
System.out.println("原始数据类型-本次耗时1:"+(System.nanoTime() - start));
//第二个测试
start = System.nanoTime();
for(int y = 0;y<60;y++){
int res = bmp2[40][y];
}
System.out.println("原始数据类型-本次耗时2:"+(System.nanoTime() - start));
}
}
Test results for use case 1:
String array - this time 1: 18972
String array - this time 2: 5909
Test results for use case 2:
Primitive data type - this time 1: 34523
Primitive data type - this time 2: 3110