java-如何获取数组的索引

概述protecteddouble[]cpi={10,10.1,10.3,11.6,13.7,16.5}protectedCharSequence[]fromDate={"1914","1915","1916","1917","1918",&q

protected double[] cpi = { 10, 10.1, 10.3, 11.6, 13.7, 16.5 }  protected CharSequence[] fromDate = {           "1914",          "1915",          "1916",          "1917",          "1918",          "1919"};  protected CharSequence[] toDate = {           "1914",          "1915",          "1916",          "1917",          "1918",          "1919"};

我正在尝试以下方法：

double factor = cpi[frmDate[k]] / cpi [toDate[k]];

我都收到以下错误：

Type mismatch: cannot convert from CharSequence to int

Type mismatch: cannot convert from CharSequence to int

我想做的是…如果fromDate的选择是index = 2而toDate的选择是index = 3,则计算以下内容：

double factor = cpi[10.3] / cpi[11.6];

解决方法:

您可能想要这样：

protected double[] cpi = { 10, 10.1, 10.3, 11.6, 13.7, 16.5 }  protected CharSequence[] fromDate = {           "1914",          "1915",          "1916",          "1917",          "1918",          "1919"};  protected CharSequence[] toDate = {           "1914",          "1915",          "1916",          "1917",          "1918",          "1919"};String year1 = "1915";String year2 = "1918";indexYear1 = Arrays.asList(fromDate).indexOf(year1); //find the position (index) of year1 => 1indexYear2 = Arrays.asList(toDate).indexOf(year2); //find the position (index) of year2 => 4double factor = cpi[indexYear1] / cpi[indexYear2]; // => 10.1 / 13.7

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