Java 从零开始 5.1 String

public class StringTest {
    public static void main(String[] args) {
        //构造方法
        String s1 = new String();
        char[] a1 = {'a','b','c'};
        String s2 = new String(a1);
        byte[] a2 = {97,98,99};
        String s3 = new String(a2);
        String s4 = "abc";
        
        String s5 = "abc";
        System.out.println("s5==s4?" + (s5==s4));//可以看到结果为true

        //Sting中常用的方法
        //equals(String)比较s2和s3的值，一样返回true,反之false
        System.out.println("equals():" + s2.equals(s3));
        //length()返回字符串的长度
        System.out.println("length():" + s2.length());
        //charAt(int i)返回字符串索引为i的字符
        System.out.println("charAt():" + s2.charAt(0));
        //endWith(String s)判断是否以s为结尾，是返回true,反之false
        System.out.println("charAt():" + s2.endsWith("c"));

        //遍历字符串
        System.out.println("遍历字符串:");
        for(int i=0; i 
结果如下：