Builder模式使用链式结构创建复杂对象，将过程与结果分开，创建过程中可以自行组合。

使用场景

一个对象，不同组合,不同顺序生成不同的结果
优点：封装性更规范，程序调用不用关系内部细节，注重结果即可
缺点：如果builder对象过多，会加大内存消耗

public class TabInfoBean { private int count;//Tab的个数 必选 private int currentTab;//默认选中的tab 必选 private String[] tabText;//文字必选 private int normalResId;//可选 private int selectResId;//可选 private int normalTextColor;//可选 private int selectTextColor;//可选 private int normalTextSizeSp;//可选 private int selectTextSizeSp;//可选 private TabInfoBean(TabInfoBuilder builder) { this.tabText = builder.tabText; this.count = builder.count; this.currentTab = builder.currentTab; this.normalResId = builder.normalResId; this.selectResId = builder.selectResId; this.normalTextColor = builder.normalTextColor; this.selectTextColor = builder.selectTextColor; this.normalTextSizeSp = builder.normalTextSizeSp; this.selectTextSizeSp = builder.selectTextSizeSp; } public int getCount() { return count; } public void setCount(int count) { this.count = count; } public int getCurrentTab() { return currentTab; } public void setCurrentTab(int currentTab) { this.currentTab = currentTab; } public int getNormalResId() { return normalResId; } public void setNormalResId(int normalResId) { this.normalResId = normalResId; } public int getSelectResId() { return selectResId; } public void setSelectResId(int selectResId) { this.selectResId = selectResId; } public int getNormalTextColor() { return normalTextColor; } public void setNormalTextColor(int normalTextColor) { this.normalTextColor = normalTextColor; } public int getSelectTextColor() { return selectTextColor; } public void setSelectTextColor(int selectTextColor) { this.selectTextColor = selectTextColor; } public String[] getTabText() { return tabText; } public void setTabText(String[] tabText) { this.tabText = tabText; } public int getNormalTextSizeSp() { return normalTextSizeSp; } public void setNormalTextSizeSp(int normalTextSizeSp) { this.normalTextSizeSp = normalTextSizeSp; } public int getSelectTextSizeSp() { return selectTextSizeSp; } public void setSelectTextSizeSp(int selectTextSizeSp) { this.selectTextSizeSp = selectTextSizeSp; } public static class TabInfoBuilder { private int count; private int currentTab; private String[] tabText; private int normalResId; private int selectResId; private int normalTextColor; private int selectTextColor; private int normalTextSizeSp;//可选 private int selectTextSizeSp;//可选 public TabInfoBuilder(String[] tabText, int count, int currentTab) { this.tabText = tabText; this.count = count; this.currentTab = currentTab; } public TabInfoBuilder setNormalResId(int normalResId) { this.normalResId = normalResId; return this; } public TabInfoBuilder setSelectResId(int selectResId) { this.selectResId = selectResId; return this; } public TabInfoBuilder setNormalTextColor(int normalTextColor) { this.normalTextColor = normalTextColor; return this; } public TabInfoBuilder setSelectTextColor(int selectTextColor) { this.selectTextColor = selectTextColor; return this; } public TabInfoBuilder setNormalTextSizeSp(int size) { this.normalTextSizeSp = size; return this; } public TabInfoBuilder setSelectTextSizeSp(int size) { this.selectTextSizeSp = size; return this; } public TabInfoBean build() { return new TabInfoBean(this); } }}

调用方式

String[] name={"我","是","谁"}; TabInfoBean.TabInfoBuilder tabInfoBuilder=new TabInfoBean.TabInfoBuilder(name,5,0);

github代码地址

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