Question

android 判断字符串是不是为空的最优方法

Answer 1

java] view plain copy print?
public class TestEmptyString {
　　String s = "";
　　long n = 10000000;
　　private void function1() {
　　long startTime = System.currentTimeMillis();
　　for (long i = 0; i < n; i++) {
　　if (s == null || s.equals(""))
　　;
　　}
　　long endTime = System.currentTimeMillis();
　　System.out.println("function 1 use time: " + (endTime - startTime)
　　+ "ms");
　　}
　　private void function2() {
　　long startTime = System.currentTimeMillis();
　　for (long i = 0; i < n; i++) {
　　if (s == null || s.length() <= 0)

Answer 2

TextUtils.isEmpty(s)

Answer 3

　if (s == null || s.length() <= 0) ｛

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