Java String.split(String regex, int limit)使用

split的作用:

将一个字符串分割为子字符串,然后将结果作为字符串数组返回。

参数说明:

String regex:

regex音译为正则表达式,简单理解就是我们用来分割字符串的一个规则。

int limit:

limit音译为限制,通俗的说就是设置返回数组元素的个数

看代码(1):

	public static void main(String[] args) {
		String source = "A&BC&DEF&GH";//演示字符串数据源
		//设置limit=0时
		String [] segment = source.split("&", 0);//分割数组数据
		System.out.println("分割数组长度:"+segment.length);
		System.out.println("分割数组数据:"+Arrays.toString(segment));
	}
输出结果:
分割数组长度:4
分割数组数据:[A, BC, DEF, GH]

 看代码(2):

	public static void main(String[] args) {
		String source = "A&BC&DEF&GH";//演示字符串数据源
		//设置limit=1时
		String [] segment = source.split("&", 1);//分割数组数据
		System.out.println("分割数组长度:"+segment.length);
		System.out.println("分割数组数据:"+Arrays.toString(segment));
	}
输出结果:
分割数组长度:1
分割数组数据:[A&BC&DEF&GH]

 看代码(3):

	public static void main(String[] args) {
		String source = "A&BC&DEF&GH";//演示字符串数据源
		//设置limit=2时
		String [] segment = source.split("&", 2);//分割数组数据
		System.out.println("分割数组长度:"+segment.length);
		System.out.println("分割数组数据:"+Arrays.toString(segment));
	}
输出结果:
分割数组长度:2
分割数组数据:[A, BC&DEF&GH]

 

 再来做一个测试,以下测试个人觉得对我的业务有用,看下面的代码:

	public static void main(String[] args) {
		String source = "A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC" +
				"&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&D" +
				"EF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&G" +
				"H&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&";//演示字符串数据源
		//设置limit=2时
		Long t1 = System.currentTimeMillis();
		String [] segment1 = source.split("&");//分割数组数据
		System.out.println("1消耗时间:"+String.valueOf(System.currentTimeMillis()-t1));
		
		Long t2 = System.currentTimeMillis();
		String [] segment2 = source.split("&", 2);//分割数组数据
		System.out.println("2消耗时间:"+String.valueOf(System.currentTimeMillis()-t2));
		
		System.out.println("分割数组长度:"+segment1.length);
		System.out.println("分割数组数据:"+Arrays.toString(segment1));
		System.out.println("分割数组长度:"+segment2.length);
		System.out.println("分割数组数据:"+Arrays.toString(segment2));
	}
输出结果:
1消耗时间:1
2消耗时间:0
分割数组长度:116
分割数组数据:[A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH, A, BC, DEF, GH]
分割数组长度:2
分割数组数据:[A, BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&A&BC&DEF&GH&]

 因为我只要第一条拆分出来的数据,所以嘿嘿,请楼下回答有什么好与坏处吧。

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