Java String replace()用法及代碼示例

java string replace() 方法返回一個字符串，將所有舊的 char 或 CharSequence 替換為新的 char 或 CharSequence。

從 JDK 1.5 開始，引入了一個新的 replace() 方法，允許您替換一係列字符值。

內部實現

public String replace(char oldChar, char newChar) {
        if (oldChar != newChar) {
            int len = value.length;
            int i = -1;
            char[] val = value; /* avoid getfield opcode */

            while (++i < len) {
                if (val[i] == oldChar) {
                    break;
                }
            }
            if (i < len) {
                char buf[] = new char[len];
                for (int j = 0; j < i; j++) {
                    buf[j] = val[j];
                }
                while (i < len) {
                    char c = val[i];
                    buf[i] = (c == oldChar) ? newChar:c;
                    i++;
                }
                return new String(buf, true);
            }
        }
        return this;
    }

簽名

java字符串中有兩種替換方法。

public String replace(char oldChar, char newChar)
and
public String replace(CharSequence target, CharSequence replacement)

從 JDK 1.5 開始添加了第二個替換方法。

參數

oldChar：老字號

newChar:新角色

target:目標字符序列

replacement:替換字符序列

替換字符串

Java String replace(char old, char new) 方法示例

public class ReplaceExample1{
public static void main(String args[]){
String s1="javatpoint is a very good website";
String replaceString=s1.replace('a','e');//replaces all occurrences of 'a' to 'e'
System.out.println(replaceString);
}}

jevetpoint is e very good website

Java String replace(CharSequence target, CharSequence replacement) 方法示例

public class ReplaceExample2{
public static void main(String args[]){
String s1="my name is khan my name is java";
String replaceString=s1.replace("is","was");//replaces all occurrences of "is" to "was"
System.out.println(replaceString);
}}

my name was khan my name was java

Java 字符串 replace() 方法示例 3

public class ReplaceExample3 {
	public static void main(String[] args) {
		String str = "oooooo-hhhh-oooooo";
		String rs = str.replace("h","s"); // Replace 'h' with 's'
		System.out.println(rs);
		rs = rs.replace("s","h"); // Replace 's' with 'h'
		System.out.println(rs);
	}
}

oooooo-ssss-oooooo
oooooo-hhhh-oooooo

相關用法

注：本文由純淨天空篩選整理自 Java String replace()。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。