package stringTest;

public class StringDemo2 {
	public static void main(String[] args) {
		String s = "acvbb";
		String s1 = new String("acvbb");
		
		String s2 = s.replace("a", "X");
		String s3 = s1.replace("a", "X");
		
		/**
		 * String类中的replace方法表示字符串替换，不改变原始的字符串；
		 * 该方法返回替换后的字符串
		 * */
		System.out.println("s = " + s);  //s = acvbb
		System.out.println("s2 = " + s2); //s2 = Xcvbb
		
		System.out.println("s1 = " + s1); //s1 = acvbb
		System.out.println("s3 = " + s3); //s3 = Xcvbb
	}
}

打印输出结果：

s = acvbb
s2 = Xcvbb
s1 = acvbb
s3 = Xcvbb

java中String类中的replace方法