2.2String工具类

Posted 2021-02-17 wan19890618123

1：split方法 

public class SplitDemo1 {
    
        public static String[] name = new String[20];
        public SplitDemo1() {
        String s = "The rain in Spain falls mainly in the plain.";
        // 在每个空格字符处进行分解。
        name = s.split("");
        }
        public static void main(String[] args) {
        SplitDemo1 demo = new SplitDemo1();
        for (int i = 0; i < name.length; i++)
        System.out.println(name[i]);
        }
        }//输出结果为T,h,e  r单个字符和空格
//如果将name = s.split("");此处的"" 变为" "之间加一个空格  输出结果将会是

The rain in Spain falls mainly in the plain将会按照空格为截取点
将截取的内容一次放入数组name[0][1][2]

 

2：charAt()

public void dome2(String a) {
        String[] split = a.split("//|");
        for(int i =0;i<split.length;i++) {
            char s = split[i].charAt(0);
            System.out.println(s);
        }//String name = "asdf";    char s = name.charAt(0)表示返回 字符串name的第一个字符

3:Arrays.equals

public void show() {
        String name1[] = {"a","b","c","d"}; 
        String name2[] = {"b","a","c","d"}; 
        boolean flag = Arrays.equals(name1, name2);
        System.out.println(flag);//比较的是两个数组里面的内容是否一致，并且同一下标要对应 相同的值；
        System.out.println(Arrays.toString(name1));
        
    }//将两个字符串进行比较，比较的是两个数组里面的内容是否一致，并且同一下标要对应 相同的值；