public String replace(char oldChar, char newChar ) ------將舊字符串替換成新的字符串

public String[] split(String str) ------根據str作拆分

代碼詳情：
public class Demo05 {
public static void main(String[] args) {

    String content="java是世界上最好的java編程語言,java真香";
    //10.replace(char old char new);用新的字符/字符串替換舊的字符/字符串

    System.out.println(content.replace("java","php"));

    //11.split();對字符串進行拆分
    String say="java is the best   programing language,java xiang";
    String[] arr=say.split("[ ,]+");
    System.out.println(arr.length );
    for (String string:arr) {
        System.out.println(string);
    }
    System.out.println("=======================");

    //補充兩個方法equals、compareTo();
    String s1="hello";
    String s2="HELLO";
    System.out.println(s1.equals(s2));
    //equalsIgnoreCase 忽略大小寫的比較
    System.out.println(s1.equalsIgnoreCase(s2));

    //compareTo();比較大小：比較的是兩個字符在編碼表里面的位置
    String s3="abc";//a:97
    String s4="xyz";//x:120
    System.out.println(s3.compareTo(s4));

    //此時比較的是長度，3-6=-3；輸出結果為-3
    String s5="abc";
    String s6="abcxyz";
    System.out.println(s5.compareTo(s6));
}

}