JAVA 中int型別轉String型別的通常方法,有三種:
1、String.valueOf(int i)
2、Integer.toString(int i)
3、i+""; //i 為 int型別 三種方法效率排序為: Integer.toString(int i) > String.valueOf(int i) > i+""; 程式碼測試: public static void main(String[] args) { int[] intArr = new int[1000000]; String[] strArr1 = new String[1000000];//為了公平分別定義三個陣列 String[] strArr2 = new String[1000000]; String[] strArr3 = new String[1000000]; //賦值 Long t1 = System.currentTimeMillis(); for(int i=0;i<1000000;i++){ intArr[i]=i+1; } Long t2 = System.currentTimeMillis(); for(int i=0;i<1000000;i++){ strArr1[i] = String.valueOf(intArr[i]); } Long t3 = System.currentTimeMillis(); for(int i=0;i<1000000;i++){ strArr2[i] = Integer.toString(intArr[i]); } Long t4 = System.currentTimeMillis(); for(int i=0;i<1000000;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("賦值:"+(t2-t1)); System.out.println("String.valueOf(i):"+(t3-t2)); System.out.println("Integer.toString(i):"+(t4-t3)); System.out.println("i+\"\":"+(t5-t4)); } 我的測試結果為: t1 = 1298798872078 t2 = 1298798872093 t3 = 1298798872656 t4 = 1298798873000 t5 = 1298798873671 賦值:15 String.valueOf(i):563 Integer.toString(i):344 i+"":671
JAVA 中int型別轉String型別的通常方法,有三種:
1、String.valueOf(int i)
2、Integer.toString(int i)
3、i+""; //i 為 int型別 三種方法效率排序為: Integer.toString(int i) > String.valueOf(int i) > i+""; 程式碼測試: public static void main(String[] args) { int[] intArr = new int[1000000]; String[] strArr1 = new String[1000000];//為了公平分別定義三個陣列 String[] strArr2 = new String[1000000]; String[] strArr3 = new String[1000000]; //賦值 Long t1 = System.currentTimeMillis(); for(int i=0;i<1000000;i++){ intArr[i]=i+1; } Long t2 = System.currentTimeMillis(); for(int i=0;i<1000000;i++){ strArr1[i] = String.valueOf(intArr[i]); } Long t3 = System.currentTimeMillis(); for(int i=0;i<1000000;i++){ strArr2[i] = Integer.toString(intArr[i]); } Long t4 = System.currentTimeMillis(); for(int i=0;i<1000000;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("賦值:"+(t2-t1)); System.out.println("String.valueOf(i):"+(t3-t2)); System.out.println("Integer.toString(i):"+(t4-t3)); System.out.println("i+\"\":"+(t5-t4)); } 我的測試結果為: t1 = 1298798872078 t2 = 1298798872093 t3 = 1298798872656 t4 = 1298798873000 t5 = 1298798873671 賦值:15 String.valueOf(i):563 Integer.toString(i):344 i+"":671