比较if语句中的两个LongWritable

Question

如何在If语句中比较两个LongWritable ???等，

if(compareTo(key1,new LongWritable(1))
 { 

    //do something;
 }

Answer 1

LongWritable实现Comparable，所以使用compareTo方法：

if (lw1.compareTo(lw2) == 0) {
  // lw1 has same value as lw2
}