java判断字符串不为空

public void function1(String s,int n) { long startTime = System.currentTimeMillis(); for(long i = 0; i
        

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public void function2(String str,int n) { long startTime = System.currentTimeMillis(); for(long i = 0; i< n; i++) { if(s == null || s.length() <= 0); } long endTime = System.currentTimeMillis(); System.out.println("function 2 use time: "+ (endTime - startTime) +"ms"); }