Android比较字符串是否为空(isEmpty)

StringUtils.java:

package com.yx.equipment_collection.utils;

import android.annotation.SuppressLint;
import android.text.TextUtils;
import android.util.Log;

/**
*
* 此类描述的是: String帮助类
*
* @author: CS YX
* @version:1.0
* @date:2014-10-21 下午2:47:08
*/
public class StringUtils {
private static final String TAG = "StringUtils";
private static int count = 100000000;

public static void checkEmpty1(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str == null || str.length() < 1) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty1 --- " + (end - start));
}

@SuppressLint("NewApi")
public static void checkEmpty2(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str == null || str.isEmpty()) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty2 --- " + (end - start));
}

public static void checkEmpty3(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str == null || str == "") {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty3 --- " + (end - start));
}

public static void checkEmpty4(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str == null || str.equals("")) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty4 --- " + (end - start));

}

public static void checkEmpty5(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str == null || TextUtils.isEmpty(str)) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty5 --- " + (end - start));

}

public static void checkEmpty11(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str != null && str.length() > 0) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty11 --- " + (end - start));
}

@SuppressLint("NewApi")
public static void checkEmpty22(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str != null && !str.isEmpty()) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty22 --- " + (end - start));
}

public static void checkEmpty33(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str != null && str != "") {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty33 --- " + (end - start));
}

public static void checkEmpty44(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str != null && !str.equals("")) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty44 --- " + (end - start));

}

public static void checkEmpty55(String str) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
if (str != null && !TextUtils.isEmpty(str)) {
}
}
long end = System.currentTimeMillis();
Log.i(TAG, "checkEmpty55 --- " + (end - start));

}

}