48 lines
1.4 KiB
Java
48 lines
1.4 KiB
Java
package chapter5.demo51;
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public class OrderID {
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public static void main(String[] args) {
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System.out.println("====String实现====");
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int[] time = {2024, 1107, 1040};
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String orderID = arrayToString(time);
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System.out.println("订单号 " + orderID);
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System.out.println("\n====StringBuffer实现====");
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int[] time2 = {2023, 1006, 1200};
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String orderID2 = arrayToString(time2);
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System.out.println("订单号 " + orderID2);
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}
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/**
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* 将数组拼接成字符串，并在首尾添加`OID:[]`
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* 注意：使用String实现
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* @param arr 存放数字的数组
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* @return 拼接后的字符串，格式为`[202411071040]`
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*/
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public static String arrayToString(int[] arr) {
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String s = "";
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s += "OID:[";
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for (int c : arr) {
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s += c;
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}
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s += ']';
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return s;
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}
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/**
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* 将数组拼接成字符串，并在首尾添加`OID:[]`
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* 注：使用StringBuffer实现
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* @param arr 存放数字的数组
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* @return 拼接后的字符串，格式为`[202411071040]`
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*/
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public static String arrayToStringUsingBuffer(int[] arr) {
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StringBuffer sb = new StringBuffer();
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sb.append("OID:[");
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for (int c : arr) {
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sb.append(c);
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}
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sb.append("]");
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return sb.toString();
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}
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}
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