Java 整数相除保留小数

Java整数相除保留小数

public static void main(String[] args) throws IOException {

    Integer x = 30;

    Integer y = 9;

    float diff = (float)x/(float)y;

    float diff1 = (float) x/y;

    DecimalFormat df = new DecimalFormat("0.00");

    String s = df.format((float)x/y);

}

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