Java Arraylist 在列表中每隔一个数字打印一次
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Java Arraylist printing every other number in a list
提问by Nicole
This is my code for printing the random numbers in an arraylist:
这是我在数组列表中打印随机数的代码：
public void printList()
{
System.out.println("The numbers on the list: ") ;
for (int i = 0 ; i < aList.size() ; i++)
{
System.out.print( aList.get(i) + " ") ;
}
System.out.println("\n") ;
}
How would I print every other number of this same list? By using a do-while loop?
我将如何打印相同列表的所有其他数字？通过使用 do-while 循环？
回答by ahanin
Put additional if statement inside your for block which would check for parity: if (i % 2 == 0) { System.out.print(... }
在 for 块中添加额外的 if 语句，用于检查奇偶校验： if (i % 2 == 0) { System.out.print(... }
回答by horbags
Above approach is ineffecient. Just increment the index by 2
以上方法无效。只需将索引增加 2
public void print()
{
System.out.println("The numbers on the list: ") ;
for (int i = 0 ; i < aList.size() ; i+=2)
{
System.out.print( aList.get(i) + " ") ;
}
System.out.println();
}
