java char[] string[] string转换

String s = "abc edf ";

String[] str = s.split(" ");

String[] newStrArray = new String() {"abc", "edf"};

String.join(" ", newStrArray);

char[] c = new char[](){'a', 'b', 'c'};

String s = new String(c);

// String的底层源码，String底层是private final char value[];
public String(char value[]) {
    this.value = Arrays.copyOf(value, value.length);
}