## 3.2 流操作 流的使用包含三件事： - 從數據源獲取流 - 多個中間操作，組成流水線 - 一個終端操作，生成結果 本節的內容將會用到以下的`Model`類以及`DATA`： ```java import java.util.Arrays; import java.util.List; public class StreamDemo { public static void main(String[] args) { } static final List<Model> DATA = Arrays.asList( new Model(1, "A", 121.43, true), new Model(1, "B", 14.5, false), new Model(2, "C", 22.4, true), new Model(2, "D", 11.22, false), new Model(3, "E", 0.32, true), new Model(3, "F", 11.3, false), new Model(3, "G", 93.23, true) ); static class Model { String name; int type; double value; boolean success; public Model(int type, String name, double value, boolean success) { this.name = name; this.type = type; this.value = value; this.success = success; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getType() { return type; } public void setType(int type) { this.type = type; } public double getValue() { return value; } public void setValue(double value) { this.value = value; } public boolean getSuccess() { return success; } public void setSuccess(boolean success) { this.success = success; } } } ```