JAVA中int转String类型效率比较(含Integer.toString(int i) vs String.valueOf(int i) ) |
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JAVA 中int类型转String类型的通常方法,有三种:
1、String.valueOf(int i) 2、Integer.toString(int i) 3、i+""; //i 为 int类型
三种方法效率排序为: Integer.toString(int i) > String.valueOf(int i) > i+""; 代码测试: public static void main(String[] args) { int[] intArr = new int[1000000]; String[] strArr1 = new String[1000000];//为了公平分别定义三个数组 String[] strArr2 = new String[1000000]; String[] strArr3 = new String[1000000]; //赋值 Long t1 = System.currentTimeMillis(); for(int i=0;i strArr1[i] = String.valueOf(intArr[i]); } Long t3 = System.currentTimeMillis(); for(int i=0;i strArr3[i] = intArr[i]+""; } Long t5 = System.currentTimeMillis(); System.out.println("t1 = "+t1); System.out.println("t2 = "+t2); System.out.println("t3 = "+t3); System.out.println("t4 = "+t4); System.out.println("t5 = "+t5); System.out.println("赋值:"+(t2-t1)); System.out.println("String.valueOf(i):"+(t3-t2)); System.out.println("Integer.toString(i):"+(t4-t3)); System.out.println("i+\"\":"+(t5-t4));}
我的测试结果为: t1 = 1298798872078t2 = 1298798872093t3 = 1298798872656t4 = 1298798873000t5 = 1298798873671赋值:15String.valueOf(i):563Integer.toString(i):344i+"":671 |
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