1当我选中blod的时候，java变成粗体。 2当我选中Italic的时候显示为斜体。 3当我两个都选中的时候显示为粗体和斜体。 4当我不选的时候正常。如下图要求java字体能随按键改变-A time when I select the blod, java bold. 2 When I select the Italic shown in italics. 3 When I select a time when the two are shown in bold and itali

SparseArrays map integers to Objects. Unlike a normal array of Objects, there can be gaps in the indices. It is intended to be more efficient than using a HashMap to map Integers to Objects.