import com.apple.laf.AquaIcon.SystemIcon; //导入依赖的package包/类
public static IconUIResource getCautionImageIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return getAppIconCompositedOn(AquaIcon.SystemIcon.getCautionIcon());
}
 

import com.apple.laf.AquaIcon.SystemIcon; //导入依赖的package包/类
public static IconUIResource getStopImageIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return getAppIconCompositedOn(AquaIcon.SystemIcon.getStopIcon());
}
 

import com.apple.laf.AquaIcon.SystemIcon; //导入依赖的package包/类
static IconUIResource getAppIconCompositedOn(final SystemIcon systemIcon) {
    systemIcon.setSize(kAlertIconSize, kAlertIconSize);
    return getAppIconCompositedOn(systemIcon.createImage());
}
 

import com.apple.laf.AquaIcon.SystemIcon; //导入依赖的package包/类
public static IconUIResource getTreeFolderIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return AquaIcon.SystemIcon.getFolderIconUIResource();
}
 

import com.apple.laf.AquaIcon.SystemIcon; //导入依赖的package包/类
public static IconUIResource getTreeOpenFolderIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return AquaIcon.SystemIcon.getOpenFolderIconUIResource();
}
 

import com.apple.laf.AquaIcon.SystemIcon; //导入依赖的package包/类
public static IconUIResource getTreeDocumentIcon() {
    // public, because UIDefaults.ProxyLazyValue uses reflection to get this value
    return AquaIcon.SystemIcon.getDocumentIconUIResource();
}