java 百分比显示Double类型数值

DecimalFormat percent = new DecimalFormat("0.00%");
completed_num = (double) involvedTask_finished/userInvolvedTask_sum;
completed_rate = percent.format(completed_num);





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原文地址：https://www.cnblogs.com/samwang88/p/e0c253ce3655a5a0b7c1c6c6e459ef1d.html